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X+(X+3)+(X+5)+(X+7)=56
We move all terms to the left:
X+(X+3)+(X+5)+(X+7)-(56)=0
We get rid of parentheses
X+X+X+X+3+5+7-56=0
We add all the numbers together, and all the variables
4X-41=0
We move all terms containing X to the left, all other terms to the right
4X=41
X=41/4
X=10+1/4
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