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(x+30)-(50-3x)=180
We move all terms to the left:
(x+30)-(50-3x)-(180)=0
We add all the numbers together, and all the variables
(x+30)-(-3x+50)-180=0
We get rid of parentheses
x+3x+30-50-180=0
We add all the numbers together, and all the variables
4x-200=0
We move all terms containing x to the left, all other terms to the right
4x=200
x=200/4
x=50
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