$-20\cdot10$
$\left(-21\right)\cdot\left(-48\right)$
$\frac{dy}{dt}=4\left(x^2-1\right)$
$9-12-\left(-7\right)+5-\left(-8\right)+1\left(-12\right)+3$
$-5.5n-\left(-p-8\right)$
$\frac{x^2+2x-3}{x^2-x-2}$
$\left(y-c\right)^2=4ax$
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