$9x-9-8x-32$
$7\:x\:10y^2$
$\frac{2}{7}^{-3}$
$\lim_{x\to\infty}\left(\frac{4x^2+7x}{6x^3+2x+8}\right)$
$\int_0^t\left(e^{-5t}sen\left(7t\right)\right)dt$
$4x^2-10x^2$
$\frac{12m^2-13m-25}{4m+5}$
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