$a+b-a+2b$
$\left(1+2a-3b\right)^2-\left(3b-2a-1\right)^2$
$-3\:15\:-8$
$\left(6-6\right)^2-8$
$\int\frac{1}{\left(9-x\right)^{\frac{3}{2}}}dx$
$\int\left(\frac{30}{\left(x-2\right)^6}\right)dx$
$-4\left(3c^2+44\right)$
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