Evaluate
-\frac{4k}{21}+\frac{20}{7}
Expand
-\frac{4k}{21}+\frac{20}{7}
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\frac{\frac{5\times 3}{3}-\frac{k}{3}}{3-\frac{5}{4}}
To add or subtract expressions, expand them to make their denominators the same. Multiply 5 times \frac{3}{3}.
\frac{\frac{5\times 3-k}{3}}{3-\frac{5}{4}}
Since \frac{5\times 3}{3} and \frac{k}{3} have the same denominator, subtract them by subtracting their numerators.
\frac{\frac{15-k}{3}}{3-\frac{5}{4}}
Do the multiplications in 5\times 3-k.
\frac{\frac{15-k}{3}}{\frac{12}{4}-\frac{5}{4}}
Convert 3 to fraction \frac{12}{4}.
\frac{\frac{15-k}{3}}{\frac{12-5}{4}}
Since \frac{12}{4} and \frac{5}{4} have the same denominator, subtract them by subtracting their numerators.
\frac{\frac{15-k}{3}}{\frac{7}{4}}
Subtract 5 from 12 to get 7.
\frac{\left(15-k\right)\times 4}{3\times 7}
Divide \frac{15-k}{3} by \frac{7}{4} by multiplying \frac{15-k}{3} by the reciprocal of \frac{7}{4}.
\frac{\left(15-k\right)\times 4}{21}
Multiply 3 and 7 to get 21.
\frac{60-4k}{21}
Use the distributive property to multiply 15-k by 4.
\frac{\frac{5\times 3}{3}-\frac{k}{3}}{3-\frac{5}{4}}
To add or subtract expressions, expand them to make their denominators the same. Multiply 5 times \frac{3}{3}.
\frac{\frac{5\times 3-k}{3}}{3-\frac{5}{4}}
Since \frac{5\times 3}{3} and \frac{k}{3} have the same denominator, subtract them by subtracting their numerators.
\frac{\frac{15-k}{3}}{3-\frac{5}{4}}
Do the multiplications in 5\times 3-k.
\frac{\frac{15-k}{3}}{\frac{12}{4}-\frac{5}{4}}
Convert 3 to fraction \frac{12}{4}.
\frac{\frac{15-k}{3}}{\frac{12-5}{4}}
Since \frac{12}{4} and \frac{5}{4} have the same denominator, subtract them by subtracting their numerators.
\frac{\frac{15-k}{3}}{\frac{7}{4}}
Subtract 5 from 12 to get 7.
\frac{\left(15-k\right)\times 4}{3\times 7}
Divide \frac{15-k}{3} by \frac{7}{4} by multiplying \frac{15-k}{3} by the reciprocal of \frac{7}{4}.
\frac{\left(15-k\right)\times 4}{21}
Multiply 3 and 7 to get 21.
\frac{60-4k}{21}
Use the distributive property to multiply 15-k by 4.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}