$a+ax=b$
$x p 1 + 2 ^ { x }$
$\lim_{x\to1}\left(\frac{x^3-3x+2}{x^4+5x^2+2x+2}\right)$
$2x^2-3x+6$
$\frac{3x^3+2x^2-2x-1}{x+1}$
$5y^2-15y$
$\left(1-x^2\right)\frac{dy}{dx}=y\left(1+x^2\right)$
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