$16-81m^2$
$\left(x+7\right)\cdot\left(x\cdot5\right)$
$\left(3^4\right)^9$
$a^2+20a$
$\frac{dy}{dx}=\frac{x^2+4}{y^2-5}$
$-3x+9=12$
$\left(3y-7\right)^2$
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