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(x-40)+(x-60)+x-20)=360
We move all terms to the left:
(x-40)+(x-60)+x-20)-(360)=0
We add all the numbers together, and all the variables
x+(x-40)+(x-60)=0
We get rid of parentheses
x+x+x-40-60=0
We add all the numbers together, and all the variables
3x-100=0
We move all terms containing x to the left, all other terms to the right
3x=100
x=100/3
x=33+1/3
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