Evaluate
-\frac{19a}{20}-\frac{1}{10}
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-\frac{19a}{20}-\frac{1}{10}
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-\frac{2\left(7a+6\right)}{20}-\frac{5\left(a-2\right)}{20}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 10 and 4 is 20. Multiply -\frac{7a+6}{10} times \frac{2}{2}. Multiply \frac{a-2}{4} times \frac{5}{5}.
\frac{-2\left(7a+6\right)-5\left(a-2\right)}{20}
Since -\frac{2\left(7a+6\right)}{20} and \frac{5\left(a-2\right)}{20} have the same denominator, subtract them by subtracting their numerators.
\frac{-14a-12-5a+10}{20}
Do the multiplications in -2\left(7a+6\right)-5\left(a-2\right).
\frac{-19a-2}{20}
Combine like terms in -14a-12-5a+10.
-\frac{2\left(7a+6\right)}{20}-\frac{5\left(a-2\right)}{20}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 10 and 4 is 20. Multiply -\frac{7a+6}{10} times \frac{2}{2}. Multiply \frac{a-2}{4} times \frac{5}{5}.
\frac{-2\left(7a+6\right)-5\left(a-2\right)}{20}
Since -\frac{2\left(7a+6\right)}{20} and \frac{5\left(a-2\right)}{20} have the same denominator, subtract them by subtracting their numerators.
\frac{-14a-12-5a+10}{20}
Do the multiplications in -2\left(7a+6\right)-5\left(a-2\right).
\frac{-19a-2}{20}
Combine like terms in -14a-12-5a+10.
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}