$\left(ab-4\right)\left(ab+8\right)\:$
$xy+xy^2+x^3y=7y^2$
$\left(4+e^{2x}\right)\frac{dy}{dx}=ye^{2x}$
$x^4+y^4\:=\:81.\:$
$\frac{\left(3x^5y^3\right)^5}{\left(6x^{10}y^7\right)^2}$
$2z-z$
$2x^2-13x-20=0$
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