$-1x+2x+7+-3x+-11$
$m^2-5m+25m$
$\frac{-5x^2+7x+6}{-x+2}$
$\frac{1}{\tan\left(x\right)+\frac{1}{\tan\left(x\right)}}$
$\frac{1}{6}+\frac{5}{6}+1.5$
$\lim_{x\to0}9x^{-2}e^x$
$\left(5x^3-3\right)\left(x^3+3\right)$
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