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(2x+30)+(4x+50)=180
We move all terms to the left:
(2x+30)+(4x+50)-(180)=0
We get rid of parentheses
2x+4x+30+50-180=0
We add all the numbers together, and all the variables
6x-100=0
We move all terms containing x to the left, all other terms to the right
6x=100
x=100/6
x=16+2/3
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