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15=11+64d
We move all terms to the left:
15-(11+64d)=0
We add all the numbers together, and all the variables
-(64d+11)+15=0
We get rid of parentheses
-64d-11+15=0
We add all the numbers together, and all the variables
-64d+4=0
We move all terms containing d to the left, all other terms to the right
-64d=-4
d=-4/-64
d=1/16
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