$\left(5xy+4z\right)\left(7xy-3z\right)$
$\left(4x+3y\right)^2$
$\sqrt{3x+6}+x=4$
$\left(-15\right)+20\left(-3\right)-10$
$\left(x+2\right)\cdot\:\left(x-2\right)\cdot\:\left(x+6\right)$
$4b^2\cdot8b^9$
$-32-55-62-147$
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