$\lim_{x\to0}\left(\frac{\sqrt{x+7}-\sqrt{7}}{x}\right)$
$\int\:2^{6bx}\:dx$
$\lim_{x\to-4}\frac{x^2-16}{x^2-4x}$
$\int\frac{5}{x^{7}}dx$
$9\left(-1\right)^2+12\left(-1\right)+6$
$\lim_{x\to4}\left(\frac{4-x+\:\ln\left(x-3\right)}{x^3-6x^2+32}\right)$
$x+x+4x$
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