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(17x+3)=139
We move all terms to the left:
(17x+3)-(139)=0
We get rid of parentheses
17x+3-139=0
We add all the numbers together, and all the variables
17x-136=0
We move all terms containing x to the left, all other terms to the right
17x=136
x=136/17
x=8
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