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61=3d+7
We move all terms to the left:
61-(3d+7)=0
We get rid of parentheses
-3d-7+61=0
We add all the numbers together, and all the variables
-3d+54=0
We move all terms containing d to the left, all other terms to the right
-3d=-54
d=-54/-3
d=+18
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