$\left(x+b\right)\left(a+b\right)$
$2-3+2-7$
$2x-\frac{2x}{3}$
$\frac{6x^3-2x^2+2x+9}{2x+2}$
$1\:\frac{\left(9-4\right)}{5}$
$\int\frac{2-x}{\left(85-12x+x^2\right)}dx$
$\int\frac{x^2-x}{\left(x-1\right)^2}dx$
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