$\frac{4x^4-2x^3+x-2}{2x^2-x-1}$
$x\left(a+7\right)+x\left(a+1\right)$
$\left(3x+1\right)\left(5-10x\right)$
$4^{\left(12-4x\right)}=256$
$1-125a^9y^9$
$y^2-6y$
$8a^2\:-\:10a\:-\:7\:$
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