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15.6=3.9(d+1)
We move all terms to the left:
15.6-(3.9(d+1))=0
We calculate terms in parentheses: -(3.9(d+1)), so:We get rid of parentheses
3.9(d+1)
We multiply parentheses
3.9d+3.9
Back to the equation:
-(3.9d+3.9)
-3.9d-3.9+15.6=0
We add all the numbers together, and all the variables
-3.9d+11.7=0
We move all terms containing d to the left, all other terms to the right
-3.9d=-11.7
d=-11.7/-3.9
d=+3
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