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3.6=0.2d-2.8
We move all terms to the left:
3.6-(0.2d-2.8)=0
We get rid of parentheses
-0.2d+2.8+3.6=0
We add all the numbers together, and all the variables
-0.2d+6.4=0
We move all terms containing d to the left, all other terms to the right
-0.2d=-6.4
d=-6.4/-0.2
d=+32
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