$2x^2+3x-5;\:x=-2$
$\frac{4x^5}{6x^1}\left(2x^4\right)$
$108p^2-252p+147$
$-10r-20=-20$
$\frac{dq}{dt}=-4q+12$
$\frac{4\:x^3\:-\:x^2\:+\:15\:x\:-\:29}{2x^3\:-\:x^2\:+\:8x\:-\:4}\:$
$4x^2+25y^2-36+20xy$
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