Evaluate
\frac{9-x}{x+10}
Expand
-\frac{x-9}{x+10}
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\frac{8-x}{10+x}-\frac{-3}{3\left(x+10\right)}
Factor 30+3x.
\frac{3\left(8-x\right)}{3\left(x+10\right)}-\frac{-3}{3\left(x+10\right)}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 10+x and 3\left(x+10\right) is 3\left(x+10\right). Multiply \frac{8-x}{10+x} times \frac{3}{3}.
\frac{3\left(8-x\right)-\left(-3\right)}{3\left(x+10\right)}
Since \frac{3\left(8-x\right)}{3\left(x+10\right)} and \frac{-3}{3\left(x+10\right)} have the same denominator, subtract them by subtracting their numerators.
\frac{24-3x+3}{3\left(x+10\right)}
Do the multiplications in 3\left(8-x\right)-\left(-3\right).
\frac{27-3x}{3\left(x+10\right)}
Combine like terms in 24-3x+3.
\frac{3\left(-x+9\right)}{3\left(x+10\right)}
Factor the expressions that are not already factored in \frac{27-3x}{3\left(x+10\right)}.
\frac{-x+9}{x+10}
Cancel out 3 in both numerator and denominator.
\frac{8-x}{10+x}-\frac{-3}{3\left(x+10\right)}
Factor 30+3x.
\frac{3\left(8-x\right)}{3\left(x+10\right)}-\frac{-3}{3\left(x+10\right)}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 10+x and 3\left(x+10\right) is 3\left(x+10\right). Multiply \frac{8-x}{10+x} times \frac{3}{3}.
\frac{3\left(8-x\right)-\left(-3\right)}{3\left(x+10\right)}
Since \frac{3\left(8-x\right)}{3\left(x+10\right)} and \frac{-3}{3\left(x+10\right)} have the same denominator, subtract them by subtracting their numerators.
\frac{24-3x+3}{3\left(x+10\right)}
Do the multiplications in 3\left(8-x\right)-\left(-3\right).
\frac{27-3x}{3\left(x+10\right)}
Combine like terms in 24-3x+3.
\frac{3\left(-x+9\right)}{3\left(x+10\right)}
Factor the expressions that are not already factored in \frac{27-3x}{3\left(x+10\right)}.
\frac{-x+9}{x+10}
Cancel out 3 in both numerator and denominator.
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}