$\left(x+1\right)\left(x+2\right)+\left(x+2\right)\left(x+3\right)-2\left(x+5\right)\left(x-2\right)-2x^2$
$\int\frac{x+1}{x^3-x^2-2x}dx$
$\frac{2x-1}{\:4}=\frac{2}{2x+1}$
$x^2\left(2x+1\right)^3$
$y^2+6y$
$3a^2+ab$
$-685.01+123.00$
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