$e^x+xe^x=0$
$\int\left(3x\left(9-x^{-9}\right)\right)dx$
$16\cdot2-9y^2$
$\left(5x-3y\right)\left(6x+7y\right)$
$\left(-1+2m\right)\left(3-4m\right)$
$\frac{x^2+1}{y^2+1}=1$
$\left(\left(x-2\right)^2+6\right)^2$
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