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2(12+x)=66
We move all terms to the left:
2(12+x)-(66)=0
We add all the numbers together, and all the variables
2(x+12)-66=0
We multiply parentheses
2x+24-66=0
We add all the numbers together, and all the variables
2x-42=0
We move all terms containing x to the left, all other terms to the right
2x=42
x=42/2
x=21
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