$12m^2-13m-420$
$ax-5ax$
$5\left(x+-1\right)=2\left(x+2\right)$
$\frac{9x+3}{16}\cdot\frac{10}{3x}$
$3.50\cdot160$
$\:\left(5b-7\right)^2$
$\left(4xy+y^5\right)\left(4xy-y^5\right)$
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