$-6=-2+2h$
$\lim_{x\to5}\left(\frac{x^2-15}{x-5}\right)$
$\lim_{x\to0}\left(\frac{x^2+2}{x-1}\right)^{\frac{1}{x}}$
$\left(3x^4\:y\:^3+2x^5y^2\right)$
$6a-8b$
$\left(2x^3+5x-3\right)+\left(2x^3-x^2+2x\right)$
$\left(x-7\right)x+2$
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