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6x+12-78=3x-12
We move all terms to the left:
6x+12-78-(3x-12)=0
We add all the numbers together, and all the variables
6x-(3x-12)-66=0
We get rid of parentheses
6x-3x+12-66=0
We add all the numbers together, and all the variables
3x-54=0
We move all terms containing x to the left, all other terms to the right
3x=54
x=54/3
x=18
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