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(X-4)+X=20
We move all terms to the left:
(X-4)+X-(20)=0
We add all the numbers together, and all the variables
X+(X-4)-20=0
We get rid of parentheses
X+X-4-20=0
We add all the numbers together, and all the variables
2X-24=0
We move all terms containing X to the left, all other terms to the right
2X=24
X=24/2
X=12
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