$\ln\left(\frac{e^b}{e^a}\right)$
$-\frac{1}{2}\left(\left(-100x-9y\right)\right)$
$\:5a+10b=-2b-4a\:$
$144a^{12}-32b^{12}$
$4c+4d$
$\lim_{x\to0}\left(\frac{1}{x}-\frac{1}{x^2-x}\right)$
$x^2+14x-51=y$
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