$-3\cdot\frac{4}{2}$
$4+37uv-4uv-33uv$
$-87\left|-78\right|$
$\left(x+2\right)\left(x-3\right)=x\left(5-x\right)-10$
$5r\:+\:3\:-\:1\:+\:6r$
$\left(4z^3\cdot2z\cdot z^3\right)^2$
$\frac{x^2-8x-2}{x+3}$
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