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X+(X+3)=149
We move all terms to the left:
X+(X+3)-(149)=0
We get rid of parentheses
X+X+3-149=0
We add all the numbers together, and all the variables
2X-146=0
We move all terms containing X to the left, all other terms to the right
2X=146
X=146/2
X=73
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