$6-\left(-27\right)$
$2-x\ge-10$
$-x^2+2x+5=0$
$\left(b+2\right)^7$
$\frac{x^2-x-20}{3x-15}$
$\int x\left(\frac{7}{x+5}-\frac{3}{2-x}\right)dx$
$\lim_{x\to0}\left(\frac{xe^{2x}}{3x^2+x}\right)$
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