$18xy\:+4y^2\:+81x^2\:+18xy$
$a^{-4}\:x\:a^{15}$
$\frac{9+\frac{1}{x}}{4-\frac{1}{x}}$
$\frac{dy}{dx}=-2x^3-x^2+4x-7$
$\frac{700}{2}$
$\frac{7}{-\infty}$
$\left(2a^4+3b\right)\left(2a^4-3b\right)$
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