$3x^2-4xy+4x^2+3xy$
$\frac{m^{12}-n^{12}}{m^3-n^3}$
$\frac{1}{\tan\:a-\sec\:a}+\frac{1}{\tan\:a+\sec\:a}$
$9-3x^2-7x^2$
$\lim_{x\to0}\left(x\right)-\lim_{x\to0}\left(\ln\left(x+1\right)\right)$
$5-+\left(-8\right)$
$10x-10-6\left(x+2\right)$
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