$6\left(9+5x\right)$
$r^2-6r+4$
$3x-6\left(x+2\right)$
$ax-bx+ay-bx$
$\int\frac{sen\:\left(x\right)\:+\:tan\:\left(x\right)}{cos\:\left(x\right)}dx$
$\lim_{x\to0}\left(\frac{\left(x+1\right)\cdot\left(2x-1\right)}{\left(2x+1\right)}\right)$
$+\left(-1\right)-\left(+15\right)-\left(-13\right)+\left(+7\right)$
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