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(x-13)+(x+45)+x=180
We move all terms to the left:
(x-13)+(x+45)+x-(180)=0
We add all the numbers together, and all the variables
x+(x-13)+(x+45)-180=0
We get rid of parentheses
x+x+x-13+45-180=0
We add all the numbers together, and all the variables
3x-148=0
We move all terms containing x to the left, all other terms to the right
3x=148
x=148/3
x=49+1/3
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