$4abc+17abd-3abc+5abc-7abd$
$\left(x+13\right)\left(x-5\right)$
$7b-6-8b$
$\int\:\frac{x^5+4x^3-3x+6}{2x^2}dx$
$x2-12x$
$\frac{1}{x+1}\ge4$
$\frac{x^3-26x-41}{x+4}$
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