$\int\frac{x^3}{\sqrt{x^2+6}}dx$
$15\cdot0$
$8^2-5\left(-12\right)$
$7u\:+\:2u\:=45$
$-3amx+4a^3x-4a^2$
$6x^2-x=15$
$\left(355-x\right)\cdot\left(70-x\right)$
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