$25x+17y-3x-2y$
$\left(-75+42\right):\:\left(-16\:+5\right)\:-15$
$\lim_{x\to0}\left(\frac{x\cos\left(x\right)}{1-cos\left(x\right)}\right)$
$\left(2y-2\right)y=2x-1$
$\int\frac{1}{3cos\left(x\right)+2}dx$
$\frac{dy}{dx}=\frac{x}{e^x}$
$2x^2-215x+17=0$
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