Evaluate
-\frac{n}{2}-\frac{18}{5}
Factor
\frac{-5n-36}{10}
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-\frac{18}{5}-\frac{n}{2}
Fraction \frac{-18}{5} can be rewritten as -\frac{18}{5} by extracting the negative sign.
-\frac{18\times 2}{10}-\frac{5n}{10}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 5 and 2 is 10. Multiply -\frac{18}{5} times \frac{2}{2}. Multiply \frac{n}{2} times \frac{5}{5}.
\frac{-18\times 2-5n}{10}
Since -\frac{18\times 2}{10} and \frac{5n}{10} have the same denominator, subtract them by subtracting their numerators.
\frac{-36-5n}{10}
Do the multiplications in -18\times 2-5n.
\frac{-36-5n}{10}
Factor out \frac{1}{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}