$3ab+4ac+7ab-2ac+25$
$-2xy+4xz$
$\left(5m^4-3m^2n^2+n^4\right)x\left(3m-n\right)$
$\int_1^2\left(e^{\sqrt{x}}\right)dx$
$43+4$
$2^{-2}\cdot\frac{3^4}{2^3}\:$
$\frac{2x^3-x^2-9x+4}{x-2}$
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