$5x+9y=120$
$\left(2x-5\right)^2=\left(6x+1\right)^2$
$\int2^x\cdot5^x$
$\left(y-8z\right)\left(y^2+8yz+64z^2\right)$
$16+5\cdot2$
$\frac{d}{dx}\left(4tan^{-1}\left(5x^2\right)\right)$
$\frac{9-\left(m+n\right)^2}{3+\left(m+n\right)^2}$
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