$9\left(b-4\right)-7b$
$4x\cdot27x^3$
$\left(y^{-1}+y^{-2}\right)\left(5y^{-3}-9y^{-4}\right)$
$\frac{x^2+x}{2}\cdot\frac{1+x^2}{2}$
$z^2+5z-14$
$17-c=10$
$\int\ln\left(2x^2+2x+1\right)dx$
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