$\left(ab+2b\right)\left(ab-3b\right)$
$\left(y^4z^2\right)^9$
$\left(\frac{y}{5}-\frac{a}{2b}\right)^2$
$7\cdot4\cdot5$
$345-572$
$16x^2-36=0$
$12\cdot7+6-30$
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