$p2-3p-4$
$\:7xy\:restar\:-8xy$
$4-7\cdot\left(-5\right)-5+9$
$9v^2\:+\:v\:+\:1$
$\frac{-2x^2y^2}{x^2}$
$\left(\frac{2}{b}+1\right)^2$
$3\left(3u+2\right)+5=2\left(2u-2\right)$
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