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12.8=3.3d
We move all terms to the left:
12.8-(3.3d)=0
We add all the numbers together, and all the variables
-(+3.3d)+12.8=0
We get rid of parentheses
-3.3d+12.8=0
We move all terms containing d to the left, all other terms to the right
-3.3d=-12.8
d=-12.8/-3.3
d=3+2.9/3.3
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