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12+x+(x-2)+3=141
We move all terms to the left:
12+x+(x-2)+3-(141)=0
We add all the numbers together, and all the variables
x+(x-2)-126=0
We get rid of parentheses
x+x-2-126=0
We add all the numbers together, and all the variables
2x-128=0
We move all terms containing x to the left, all other terms to the right
2x=128
x=128/2
x=64
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