$9\left(1-3x\right)\left(2-3x\right)$
$a-b-2a+3b$
$-y^4\:+\:20y^3\:-132y^2\:+369y\:-378$
$12g+7g$
$\int5\pi n^3dx$
$17\cdot\left(-13\right)$
$\left(x\:-2\right)^4$
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