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100+(4x-30)=180
We move all terms to the left:
100+(4x-30)-(180)=0
We add all the numbers together, and all the variables
(4x-30)-80=0
We get rid of parentheses
4x-30-80=0
We add all the numbers together, and all the variables
4x-110=0
We move all terms containing x to the left, all other terms to the right
4x=110
x=110/4
x=27+1/2
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