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(6x+100)=130
We move all terms to the left:
(6x+100)-(130)=0
We get rid of parentheses
6x+100-130=0
We add all the numbers together, and all the variables
6x-30=0
We move all terms containing x to the left, all other terms to the right
6x=30
x=30/6
x=5
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