$\int\:\frac{2x+1}{2x^2-x+6}dx$
$\frac{9}{7}x+\frac{4}{9}\left(-\frac{3}{2}+\frac{9}{10}\right)$
$x\le\:\frac{3\left(-2x+3\right)}{8}-\frac{5\left(1-x\right)}{6}$
$3mn^2+5m^2n^210m^3n^2$
$\frac{1}{b-1}=\frac{2}{b-2}$
$\left(3x+5\right)\left(3x-9\right)$
$135+\frac{1}{2}x=143+\frac{1}{4}x$
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