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12-6x=15-4x
We move all terms to the left:
12-6x-(15-4x)=0
We add all the numbers together, and all the variables
-6x-(-4x+15)+12=0
We get rid of parentheses
-6x+4x-15+12=0
We add all the numbers together, and all the variables
-2x-3=0
We move all terms containing x to the left, all other terms to the right
-2x=3
x=3/-2
x=-1+1/2
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