$b^2=-6-5b$
$\left(z^7-5\right)\cdot\left(z^7+5\right)$
$\frac{\frac{3}{x^3-1\cdot\:2\:x^2-1\cdot\:2\cdot\:\:x-3}}{x^2-1\cdot\:3\cdot\:\:x}$
$200mn^3-50mn^2$
$\int x^3\cdot\cos\left(8x\right)dx$
$b^3-b^7$
$3\left[2\left(2m-n\right)^2-2\left(2m-n\right)^2\right]$
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