Answer
$3c+2g=8$
Work Step by Step
There are 3 columns $(c)$, 2 gaps $(g)$ and 2 half-inch margins.
The page is 9 inches wide. Thus, we have an equation:
$3c+2g+\frac{1}{2}+\frac{1}{2}=9$
Simplify:
$3c+2g=8$
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