$r-9r$
$8x^2+13x-80$
$\int x\cdot\left(2x+2\right)^2dx$
$50x^2+60x+18$
$\left(14x-8\right)\left(14x+8\right)$
$\int\frac{5x}{5x+1}dx$
$x+9=17$
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