$-2x^2+32x+30$
$5\left(3z^3-6\right)+15\left(2-z^3\right)$
$21-\left(5.2+2.3\right)+\left(-8+2\right):\left(-3\right)$
$4m^4-81m^2$
$-\frac{20x^2}{5x^2}$
$\frac{10x^3-5x^2+3x-5}{x-1}$
$-2843-13000$
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