$2x+6y+3x+y$
$-9a^3b^4\:+3a^2b^2\:+\:15a^4b^3$
$\int\left(-\frac{1}{3}x\cos\left(3x\right)\right)dx$
$64m^6-100$
$-3\left(3f+9\right)+\frac{1}{2}\left(2g-8\right)$
$\left(2xy-2y\right)+\left(-2y\right)$
$\sec x+\cot x=\frac{\tan x+\cos x}{\sin x}$
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