$6a^2-7a\cdot24$
$15-45p$
$\frac{18}{3}^2$
$21z^2+11z-2\:$
$\frac{dy}{dx}=7\left(\frac{y}{x}\right)$
$-19+\left|15-48\right|$
$\left|\left(12^2+20x-15\right)+\left(7x-20+2^2\right)\right|$
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