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x+(x+3)+(x+6)=141
We move all terms to the left:
x+(x+3)+(x+6)-(141)=0
We get rid of parentheses
x+x+x+3+6-141=0
We add all the numbers together, and all the variables
3x-132=0
We move all terms containing x to the left, all other terms to the right
3x=132
x=132/3
x=44
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