$\lim_{x\to2}\left(\frac{\sin\left(\frac{\pi}{x}\right)-x+1}{x-2}\right)$
$-12=\frac{x}{16}$
$3x^2-3x-12=6x^2-6x-18$
$\frac{dy}{dx}+ax=b$
$2x-4+x-10$
$10x+q+3+5x+qx$
$3x-7\ge17$
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