$x^2+8x+c=13+c$
$3a+\left\{b-2-\left[\left(a-b\right)+\left(b-1\right)\right]\right\}$
$\theta\:+\:2\:=0$
$-4\left(2b+3\right)\left(16b+1\right)$
$ab-4a$
$e^x\cdot x-e^x$
$x^2+18x+1$
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