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2(12+3x)=42=
We move all terms to the left:
2(12+3x)-(42)=0
We add all the numbers together, and all the variables
2(3x+12)-42=0
We multiply parentheses
6x+24-42=0
We add all the numbers together, and all the variables
6x-18=0
We move all terms containing x to the left, all other terms to the right
6x=18
x=18/6
x=3
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