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90=0.20d+5
We move all terms to the left:
90-(0.20d+5)=0
We get rid of parentheses
-0.20d-5+90=0
We add all the numbers together, and all the variables
-0.2d+85=0
We move all terms containing d to the left, all other terms to the right
-0.2d=-85
d=-85/-0.2
d=+425
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