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4x-12=15+12
We move all terms to the left:
4x-12-(15+12)=0
We add all the numbers together, and all the variables
4x-12-27=0
We add all the numbers together, and all the variables
4x-39=0
We move all terms containing x to the left, all other terms to the right
4x=39
x=39/4
x=9+3/4
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