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(x+4)+x=54
We move all terms to the left:
(x+4)+x-(54)=0
We add all the numbers together, and all the variables
x+(x+4)-54=0
We get rid of parentheses
x+x+4-54=0
We add all the numbers together, and all the variables
2x-50=0
We move all terms containing x to the left, all other terms to the right
2x=50
x=50/2
x=25
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