$8\left(1-9k\right)-7$
$\int\left(x^3+3x^2\right)\frac{1}{3}\left(x^2+2x\right)dx$
$\frac{10}{2x^2}$
$70x-54x^2+4x^3$
$\log\left(x^2-9\right)-1=\log\left(x+3\right)$
$\left(\frac{x}{4}\right)^4$
$16y^2+-5y^2$
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