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X-45+X+(X-45)+X+(X-45)=540
We move all terms to the left:
X-45+X+(X-45)+X+(X-45)-(540)=0
We add all the numbers together, and all the variables
3X+(X-45)+(X-45)-585=0
We get rid of parentheses
3X+X+X-45-45-585=0
We add all the numbers together, and all the variables
5X-675=0
We move all terms containing X to the left, all other terms to the right
5X=675
X=675/5
X=135
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