$20r^2\:+\:45r^3$
$0.25k+1.5-k-3.50$
$\left(y^2-2y=7\right)\left(7y-3\right)$
$\int5x\cdot arctan\left(3x^2\right)dx$
$2\left(2w-3\right)-5\left(2v-3\right)$
$4-2x-1+4x$
$=2x^2-4x+6x^4$
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