$3\left(2-x\right)\left(x+2\right)^2$
$i^2+6i\cdot x+9x^2$
$\frac{1}{8-x}-\frac{1}{x-2}=\frac{1}{4}$
$x^3-2x^2+3x-6$
$xyz+x^2yz$
$8x^3-27y^6$
$2x^2-5x+2$
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