$f\left(x\right)=7\left(x+8\right)-7$
$\frac{5x^{-1}y^{-2}}{x-2y-4}$
$y'-y=2e^x$
$3a=-9$
$\frac{3x+9}{6x+5}+2$
$20m^3n+8m^2n^2-4m^2n$
$\left(-3x+2y\right)\left(4x-y\right)$
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