$3x^4r-72y^4r$
$\frac{x}{3}=20$
$\lim_{x\to0}\left(\frac{x^2+x}{\sqrt{x^2+2}-\sqrt{2x+2}}\right)$
$10x+9y-5y-7x$
$\int_0^{\infty}\left(t^2e^{-st}\right)dt$
$e^x\left(\sqrt{e^x+\:1}e^x\right)$
$\left(x^2y+\frac{1}{x}\right)^2$
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