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4x+(x+12)=126
We move all terms to the left:
4x+(x+12)-(126)=0
We get rid of parentheses
4x+x+12-126=0
We add all the numbers together, and all the variables
5x-114=0
We move all terms containing x to the left, all other terms to the right
5x=114
x=114/5
x=22+4/5
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