$36x^2-9x^2$
$\left(2x+x-1\right)+\left(2x+3x-3\right)$
$f\left(x\right)=\frac{1}{\left(x^2+2\right)^2}$
$\left(x^2-2\right)^5$
$\frac{1}{x^2+4x+4}$
$2x^2-5x=12$
$\frac{dy}{dx}=x-1-y^2+xy^2$
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