$\left(3m^3n-2mn^2-3n^2-8mn\right)+\left(8m^2n-6mn^2\right)$
$\lim_{x\to3}\left(\frac{x-7}{3x^2-5x-12}\right)$
$adb-b^2da=0$
$\frac{1}{1+\sin\left(x\right)}=\sec^2\left(x\right)-\sec\left(x\right)\tan\left(x\right)$
$18\cdot25$
$11a\:+\:5b\:-\:9a\:+\:7b$
$3v^2-60v=-141$
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