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15=5d-9d
We move all terms to the left:
15-(5d-9d)=0
We add all the numbers together, and all the variables
-(-4d)+15=0
We get rid of parentheses
4d+15=0
We move all terms containing d to the left, all other terms to the right
4d=-15
d=-15/4
d=-3+3/4
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