$\lim_{x\to0}\left(\frac{9^x-8^x}{3^x-2^x}\right)$
$\left(m+n^2\right)\left(x+3\right)$
$\frac{1}{x-4}-\frac{1}{3-x}-\frac{1}{x^2-7x+12}$
$\frac{kd^2}{2}=mg\cdot\left(h+d\right)$
$10\:-\:-2\:+\:-6\:-20$
$\left(-10-2\cdot4\right)$
$\lim_{x\to3}\ln\left(x\right)$
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