$8r+10-11s-7-18s$
$6y^2-6=0$
$\frac{2}{\left(2x+1\right)^{-3}}$
$b^2-4b-0$
$\int\frac{1}{\sqrt{x}\left(1-2\sqrt{x}\right)\:}dx$
$8+3-10\cdot7$
$x^2+2x-18$
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