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12x-4=3x+12+15x
We move all terms to the left:
12x-4-(3x+12+15x)=0
We add all the numbers together, and all the variables
12x-(18x+12)-4=0
We get rid of parentheses
12x-18x-12-4=0
We add all the numbers together, and all the variables
-6x-16=0
We move all terms containing x to the left, all other terms to the right
-6x=16
x=16/-6
x=-2+2/3
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