$\left(-x^3+5x^2-10x+6\right)$
$\left(-9\right)\cdot\left(-5\right)\cdot\left(-6\right)\cdot\left(-3\right)$
$\left(2a-3a^2\right)^2$
$4x+15=r$
$\frac{x^2+2x\:-3}{x^2+1}$
$\lim_{x\to1}\left(\frac{3x-3^x}{2x-2^x}\right)$
$\:9x-3+3x=129$
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