$x2-6x=18$
$\left(-50\right)-\left(-0\right)$
$3ab\:\cdot\:4a^{-1}b^{-3}\:\cdot\:4a^2b^2$
$\left(-2x^{3}+5x-6\right)\cdot\left(x^{2}-2x\right)$
$\frac{d}{du}lnu^3$
$5n\:+\:2n\:-\:7n$
$x^2\left(10x^4-5x^3+20x^2+30\right)$
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