$\log\left(128-7x\right)=2$
$\lim_{x\to0}\left(\frac{x}{x-1}-\frac{1}{ln\left(x\right)}\right)$
$\frac{x-1}{x+4}+\frac{4x-2}{x+1}$
$x^2-4x+20$
$\frac{d}{dx}\tan^3$
$\int\left(-5xe^{\left(-7x^2-3\right)}\right)dx$
$20.25-9\frac{1}{2}+11$
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