$5-2\cdot4$
$\sqrt{-\frac{75}{4}}$
$6+7b+\left(-6\right)-3b$
$\int2x\sqrt{a^2-x^2}dx$
$\left(2x^2-x-2\right)\left(2+x+2x^2\right)$
$4z^2-100$
$\left(2m+3n\right)^3$
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