$20-\left(5\right)-\left(-15\right)$
$-50\:x-10$
$9m^2+7m^3+3m^4$
$2x^2-19x+24$
$\csc\left(x\right)+\cos\left(x\right)\cot\left(x\right)=sen^3x$
$12xy+8x+5x+2y-2y-2xy$
$x^3\frac{dy}{dx}-3x^2y=2x^3y^2$
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