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6=15-d
We move all terms to the left:
6-(15-d)=0
We add all the numbers together, and all the variables
-(-1d+15)+6=0
We get rid of parentheses
1d-15+6=0
We add all the numbers together, and all the variables
d-9=0
We move all terms containing d to the left, all other terms to the right
d=9
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