$4x+7y=z$
$9x^2-36y^8$
$\frac{2x+1}{5}=\frac{y}{4}$
$\int28xe^{-7x}dx$
$\int x^33\sqrt{x^2+4}dx$
$\left(2a\:-\:3\right)^2$
$\left(x^3+7y\right)\left(x^3+11y\right)$
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