$11r+12r-4r$
$\:\left(mn\:+\:5\right)\left(mn\:-\:5\right)$
$24vw^3y^2-30v^6w^9$
$63p^3+21p^2-7p$
$\int\frac{x^2}{1+x^3}dx$
$x\:\frac{2}{2x+1}$
$\left(x+2\right)\left(x+3\right)\infty\cdot\cdot$
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