$y^2+2y-168$
$90\cdot\left(-5\right)$
$10^6e^{2-2}$
$5mn^2;m=-2\:;n=-3$
$\left(-12x^4y^3\right)\left(3x^3y^2\right)$
$\frac{2x^2+3x+2}{x+2}$
$-\left(-1\right)+\left(-7\right)$
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