Evaluate
\frac{7}{20}+\frac{3}{n}
Factor
\frac{7n+60}{20n}
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\frac{7\times 3n}{60n}+\frac{18\times 10}{60n}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 20 and 6n is 60n. Multiply \frac{7}{20} times \frac{3n}{3n}. Multiply \frac{18}{6n} times \frac{10}{10}.
\frac{7\times 3n+18\times 10}{60n}
Since \frac{7\times 3n}{60n} and \frac{18\times 10}{60n} have the same denominator, add them by adding their numerators.
\frac{21n+180}{60n}
Do the multiplications in 7\times 3n+18\times 10.
\frac{3\left(7n+60\right)}{60n}
Factor the expressions that are not already factored in \frac{21n+180}{60n}.
\frac{7n+60}{20n}
Cancel out 3 in both numerator and denominator.
Examples
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{ 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}