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x+(x+12)=123
We move all terms to the left:
x+(x+12)-(123)=0
We get rid of parentheses
x+x+12-123=0
We add all the numbers together, and all the variables
2x-111=0
We move all terms containing x to the left, all other terms to the right
2x=111
x=111/2
x=55+1/2
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