$9x-10x+y-7x+2y+3x$
$15x^{-3}z^53\:x^7\:z^{-5}$
$\lim_{x\to2}\frac{x^2\frac{2}{3}}{x-\sqrt{2x}}$
$\sin\left(\frac{y}{2}\right)\frac{dy}{dx}=\cos\left(3x\right)$
$\left(3+ab^2\right)^2$
$b^2-100$
$4xy-8xy^2-12xy^3$
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