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(x-45)+(x-45)+(x-45)=360
We move all terms to the left:
(x-45)+(x-45)+(x-45)-(360)=0
We get rid of parentheses
x+x+x-45-45-45-360=0
We add all the numbers together, and all the variables
3x-495=0
We move all terms containing x to the left, all other terms to the right
3x=495
x=495/3
x=165
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