$-28-\left(-21\right)$
$6x+5\:6x+10$
$\left(-4\right)\left(-5\right)\left(-3\right)$
$a2+a-7+2a+5$
$\int\frac{2x}{\left(x+1\right)^3}dx$
$\frac{1}{2}x\frac{3}{4}x^3+\frac{2}{3}x-\frac{5}{4}x^3$
$\frac{3a^2}{6a}$
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