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(13x+19)=84
We move all terms to the left:
(13x+19)-(84)=0
We get rid of parentheses
13x+19-84=0
We add all the numbers together, and all the variables
13x-65=0
We move all terms containing x to the left, all other terms to the right
13x=65
x=65/13
x=5
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