$7x\left(5-y\right)-3\left(9x+2\right)-4xy$
$25+3^3-8$
$\frac{dy}{dx}=\frac{y}{2x\:+\:2y}$
$0.5\cdot1.6$
$9 ( 5 v - 3 ) + 412 u + 5$
$\left(-4-b\right)\left(-3-3b\right)-8b-3$
$\int cos\left(x\right)sen^8\left(x\right)dx$
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