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15=-3+4d
We move all terms to the left:
15-(-3+4d)=0
We add all the numbers together, and all the variables
-(4d-3)+15=0
We get rid of parentheses
-4d+3+15=0
We add all the numbers together, and all the variables
-4d+18=0
We move all terms containing d to the left, all other terms to the right
-4d=-18
d=-18/-4
d=4+1/2
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