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5d+3=d+15
We move all terms to the left:
5d+3-(d+15)=0
We get rid of parentheses
5d-d-15+3=0
We add all the numbers together, and all the variables
4d-12=0
We move all terms containing d to the left, all other terms to the right
4d=12
d=12/4
d=3
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