$x^2+4x=77$
$11-13-2+56$
$\left(3x+1\right)x$
$7x\frac{dy}{dx}+y=0$
$3\left(1x+9\right)-\left(1x-6\right)$
$75\:-\left[12-\left[-4-\left[16-23+5\right]-19\right]-20\right]$
$\left(5b-9c\right)\left(5b+9c\right)$
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