$2.75x+2.25-1.5x+3$
$\lim_{x\to-\infty}\left(\frac{6x^9-2x^2-7x\:}{3x^8+11x-37\:}\right)$
$5^2.\:\:5$
$\left(-1\right)^3\cdot\left(-1\right)^2$
$\frac{2}{x}-\frac{1}{x-5}$
$2y^2-3y-xy-3y$
$\frac{dy}{dx}=1+x^2-2xy+y^2$
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