$-1+9\left(r-7\right)$
$-x^3+6x^2-12x+8$
$4d^8\cdot2d^{-6}$
$\left(y-6\right)\left(y+7\right)$
$\int\frac{-x^2+4x}{-4}-\left(-x^2+4x\right)dx$
$x^2-100=\left(x+10\right)\left(x-10\right)$
$a\frac{a}{\sqrt{a^2-x^2}}$
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