$10+\left(-12\right)-\left(-13\right)$
$\int\frac{6x}{x^3-8}\:dx$
$\left(2+k\right)^2$
$\int\frac{2x^2-1}{x\left(x^2+x-6\right)}dx$
$-x-20=2x+1$
$\int\frac{2x+3}{\left(x^2+3x+4\right)}dx$
$x+x+2v$
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