$3x\:x-25\:2x-65$
$\left(-3+5\right)\cdot\left(-6+10\right)$
$\int\left(x+2\right)\left(\frac{\left(3x+2\right)}{x}\right)dx$
$\int\frac{x^2+2x+6}{x^3-x}dx$
$\frac{d}{dx}3x^2+3xy+4y^2=25$
$\frac{dy}{dx}-3y=2e^{3x}$
$\int t\:sen\:2t\:dt$
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