$x^2+10x-220$
$8+5-7+3\left(-4+3\right)$
$4+-5+-1+-8$
$10-n=10$
$\frac{10}{9-x^2}-\frac{2}{3+x}-\frac{1}{3-x}$
$\left(2x^2+3\right)^2+3.\left(2x^2-3\right)^2+4.\left(2x^2-3\right)\left(2x^2+3\right)$
$\frac{96r^2d^6}{-12rd^3}$
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