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(2x+20)=54
We move all terms to the left:
(2x+20)-(54)=0
We get rid of parentheses
2x+20-54=0
We add all the numbers together, and all the variables
2x-34=0
We move all terms containing x to the left, all other terms to the right
2x=34
x=34/2
x=17
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