$\frac{-90}{30}$
$\frac{x^2+13x+40}{x^2-2x-35}$
$-7a+6=-9a$
$\frac{d}{dx}8$
$\int\left(\frac{\sqrt{4x^2+1}}{x^4}\right)dx$
$\left(x+3x\right)+\left(x-3x\right)$
$x^3-4x^2-11x+30$
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