s = spacing (in inches)
5 s + (3 * 13) + 20 = 7 * 12
Davide is hanging 4 pictures for his parents. They asked him to make sure all the pictures are equally spaced from each other and the ends of the wall. 3 of the pictures are 13 inches wide, one is 20 inches wide, and the wall is 7 feet across. write an equation for this situation
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