$9^2\:-\sqrt{36}-5\left(2-6\right)+\sqrt{121}$
$\frac{8x^4y^3}{x^7y^4}$
$-11a-13b+7a-3b$
$\left(2x+3y+4\right)\left(2x+3y-1\right)$
$\left(\frac{-a}{\sqrt{a^2+c^2}}\left(\sin\left(x\right)\right)\left(-\sin\left(x\right)\right)\right)$
$3x+4y+x+5y$
$m3+4mn-7m$
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