$2y^2-12y+18$
$\left(\frac{c^9}{c^{-6}}\right)^{-4}$
$\left(a+7\right)^2-\left(a-7\right)^2$
$7b+6-4-9b$
$11a+11a$
$2x^2\left(-3x^3+2x^2-6x+4\right)$
$\int\left(x^5-3\right)^2dx$
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