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3x+12=14x+63x+12=14x+6
We move all terms to the left:
3x+12-(14x+63x+12)=0
We add all the numbers together, and all the variables
3x-(77x+12)+12=0
We get rid of parentheses
3x-77x-12+12=0
We add all the numbers together, and all the variables
-74x=0
x=0/-74
x=0
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