$10x-3x+10x$
$\left(2x^3+7\right)\left(5x^2-10\right)$
$12x^8-2x^2-30$
$3^3+-6^2+\left(-2^7\right)$
$\frac{10}{5x^2-2x^3}$
$-7-1+2-1$
$9m\:+12mn+4m^2$
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