$12r+5-3r-5$
$\left(-4b+5\right)^2$
$\int\frac{2x-3}{x^2-2x+3}dx$
$v^3-8v^2+v$
$\frac{3x+1}{x-4}\le1$
$16m^2-4m+3=0$
$4\:\left(2a\:+\:7\right)\:+\:2a$
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