$x^2-18x=0$
$\lim_{x\to\infty}\left(\frac{3^{x-1}}{4^x}\right)$
$-2y\int\left(e^{-2x}\right)dx$
$m^2+3m-27$
$\sqrt[3]{27}\cdot64$
$5x^2y\cdot xy$
$\frac{5}{8}.\:\frac{5}{z}$
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