$\left(2x^7+4x^4+5x^2\right)\cdot\left(x-4\right)$
$\frac{2x^4+6x-3}{2x-4}$
$13x^3+8x$
$\log_x\left(12-32x\right)=2$
$x^2-2x-63=0$
$x2+4x+4\:if\:x\:=\:-2$
$6^{-2}\cdot6^5$
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