$\frac{x^3+2x+x+18}{x}$
$\frac{2x-4}{3}=10$
$\int\frac{1}{5x^2-9}dx$
$-6\cdot73$
$1+-1+2+-2$
$\left(2+2x\right)\left(3-x\right)$
$\left(7-14x\right)^2$
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