$2x\:-\:9\left(3x\:-\:4\right)\:=\:86$
$\left[\left(2x^2-x\right)+\left(x^3-1\right)\right]\left[\left(2x^2-x\right)-\left(x^3-1\right)\right]$
$\left(-2\right)^2\cdot\left(-2^2\right)$
$x^2-y^2=4$
$\frac{2}{3}x+x-4=31$
$5^217$
$\frac{x^4-3x^2+2x+2}{x-1}$
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