$-\frac{2}{3}-\frac{1}{3}$
$\frac{\left(-3x\right)^2}{-3x^2}$
$\int\left(\frac{2x}{7+x}\right)dx$
$1\:-1\:2\:1$
$\ln\left(6\right)+\ln\left(x^2+\frac{5x}{6}\right)=0$
$10-4\left(2x+6\right)$
$\int\left(2x^2+7x+1\right)cos\left(x\right)dx$
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