$8a^2b-6a^2b$
$\left(-1153\right)+\left(-13003\right)$
$18-\left(-12\right)$
$14x\:-\:6x\:+\:3\:-\:10b\:+\:7\:+\:4b$
$\frac{cot\left(t\right)+tan\left(t\right)}{csc\left(t\right)}$
$\frac{dy}{dx}=-\frac{y+2}{y\cdot\left(x+4\right)}$
$-18=-3+3u$
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