$2b+6$
$\lim_{x\to-1}\left(\frac{x^2+5x-14}{x^2-4}\right)$
$-\frac{420}{-6}$
$2x^2-7^2$
$\frac{dy}{dx}\left(3\frac{3y^2}{2}\right)^{\frac{1}{3}}$
$\left(5y+2x\right)cm$
$9x^4-34^2+25$
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