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12-4x=-15.6
We move all terms to the left:
12-4x-(-15.6)=0
We add all the numbers together, and all the variables
-4x+27.6=0
We move all terms containing x to the left, all other terms to the right
-4x=-27.6
x=-27.6/-4
x=6+2.25/2.5
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