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15-4x=0.5x-12
We move all terms to the left:
15-4x-(0.5x-12)=0
We get rid of parentheses
-4x-0.5x+12+15=0
We add all the numbers together, and all the variables
-4.5x+27=0
We move all terms containing x to the left, all other terms to the right
-4.5x=-27
x=-27/-4.5
x=+6
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