$4b^2+3b^2-4b$
$\left(x+3\right)\:\left(x-8\right)$
$\left(4a-5x\right)\left(4a+5x\right)$
$\lim_{x\to0}in\:x.\sqrt{x}$
$\left(x-4y\right)^7$
$\int x^2\left(\frac{x^3}{21}+7\right)^6dx$
$\left(y+z\right)^2-2\left(y+z\right)\left(a+y\right)+\left(a+y\right)^2$
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