$\frac{x}{x^3-1}$
$x+2>2-x$
$2x+10\cdot2x-4\cdot2x+10\cdot2x-4$
$\left(3x^2+2x-6\right)\cdot\left(4x^4\right)$
$\left(3r-s\right)\left(3r+s\right)$
$\frac{x^2-4}{x+3}$
$\left(\frac{2+15x}{5x}\right)\left(15-2x\right)$
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