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3=0.2d
We move all terms to the left:
3-(0.2d)=0
We add all the numbers together, and all the variables
-(+0.2d)+3=0
We get rid of parentheses
-0.2d+3=0
We move all terms containing d to the left, all other terms to the right
-0.2d=-3
d=-3/-0.2
d=+15
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