$5\left(-1\right)-12$
$20+90\left(-5\right)$
$\left(2x^3+5x+3\right)+\left(4x-3x^2+2x^3\right)$
$\frac{3x^2+2x-5}{x+2}$
$\left(3cd+4f\right)\left(4f-3cd\right)$
$15x+25=-20$
$\left(6x\right)^2-2\left(6x\right)\left(y^2\right)+\left(y^2\right)^2$
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