$-7ab\:+\:21ab\:-\:ab\:-\:80ab$
$\left(1+x\right)y'-2y=0$
$3\left(x-1\right)-5=3x\:-8$
$m-0.56m+0.49m$
$-15c+6=-15c$
$\lim_{x\to3}x^2-3$
$\lim_{x\to\infty}\left(ln\left(3x\right)-ln\left(b+2x\right)\right)$
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