$\lim_{x\to9}\frac{4x}{\sqrt{x+7}}$
$2\left(2\right)^4-32$
$x^2-12x=18$
$6s-12st-4s^{2}$
$x+y\cdot1$
$-5\left(2k+1\right)+6\left(-3-5k\right)$
$\frac{x^4-8}{x^2-2}$
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