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3(4x-1)=7x+12
We move all terms to the left:
3(4x-1)-(7x+12)=0
We multiply parentheses
12x-(7x+12)-3=0
We get rid of parentheses
12x-7x-12-3=0
We add all the numbers together, and all the variables
5x-15=0
We move all terms containing x to the left, all other terms to the right
5x=15
x=15/5
x=3
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