$\left(3c+7\right)+\left(-3c-9\right)$
$\frac{60xy}{30x^2y^2}$
$2x+2x^2-3x+2x^2$
$v^2-24v+144$
$\int_{-\pi}^{-\frac{\pi}{2}}\left(\frac{4\left(x+\pi^2\right)}{\pi^2}\right)dx$
$9m+8n-5f-4n+m-7n$
$-3x\sin\left(x\right)+3x^2$
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