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(x-45)+(x-45)+(x-45)+x=540
We move all terms to the left:
(x-45)+(x-45)+(x-45)+x-(540)=0
We add all the numbers together, and all the variables
x+(x-45)+(x-45)+(x-45)-540=0
We get rid of parentheses
x+x+x+x-45-45-45-540=0
We add all the numbers together, and all the variables
4x-675=0
We move all terms containing x to the left, all other terms to the right
4x=675
x=675/4
x=168+3/4
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