$\frac{x^3-\:a^3}{x-\:a}$
$\frac{dy}{dx}=7x\left(y+y^3\right)$
$\left(-x-4y\right)^2$
$3\left(2\right)^4+7$
$h+0.67h-0.36h$
$5-6x-9x^2$
$\left[\left(-4+5\right)\:-\:\left(+13\right)\right]\:-\:\left[\left(+5-25\right)\:+\:\left(-5-15\right)\right]$
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