$6-\left(-6\right)\cdot\left(-8\right)$
$2a+3=a+5$
$\int e^{-5u}du$
$2x\left(3g-18h\right)$
$cos2x=_-\frac{1}{2}$
$\left(5+i\right)\left(5-i\right)$
$5\left(u-6\right)$
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