$\left(-2k-11\right)^2$
$\int_4^xe^{3u}du$
$\left(-3x+4\right)\left(-3x-4\right)$
$3x+1+2x-3$
$\frac{dy}{dx}-\frac{6x}{5y^2}=0$
$15r-21r$
$\int\frac{6-2x}{\sqrt{-4x^2-4x+8}}dx$
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