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15x-4=12+13x
We move all terms to the left:
15x-4-(12+13x)=0
We add all the numbers together, and all the variables
15x-(13x+12)-4=0
We get rid of parentheses
15x-13x-12-4=0
We add all the numbers together, and all the variables
2x-16=0
We move all terms containing x to the left, all other terms to the right
2x=16
x=16/2
x=8
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