$\int\frac{4w+7}{\left(2w-1\right)\left(3w^2+2w+1\right)}dx$
$\frac{2x}{y^{-1}}$
$3x^4+x^2-2x+1=y$
$\left(2x-b\right)^2$
$\left(2x^2z^3\right)\left(4xy^3+3yz-y\right)$
$3x+7\left(-4x-3\right)=129$
$\int e^x\sqrt{1-e^x}dx$
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