$7x-9+2x-3x+7-4x$
$\left(-5-6\right)^2-8$
$12-\left(-8+10\right)$
$\left(7x^3+2\right)^3$
$\int x^3ln\left(4x\right)dx$
$9+7r+17r+7\:para\:r\:9$
$171-1-211$
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