$\left(2b-2a+c\right)-\left(5b+3a-3c\right)$
$3r^2-5r+8$
$20+10x+3x-4$
$\left(2x^{-4}\right)^2\left(x^4y\right)^{-3}$
$ab-4a$
$\left(\sin\left(x\right)+\cos\left(x\right)\right)^2-1=2\sin\left(x\right)\cos\left(x\right)$
$\int\left(\frac{2}{19+x}\right)dx$
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