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3.7=d-3.8
We move all terms to the left:
3.7-(d-3.8)=0
We get rid of parentheses
-d+3.8+3.7=0
We add all the numbers together, and all the variables
-1d+7.5=0
We move all terms containing d to the left, all other terms to the right
-d=-7.5
d=-7.5/-1
d=7+0.5/1
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