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66=8d+3d
We move all terms to the left:
66-(8d+3d)=0
We add all the numbers together, and all the variables
-(+11d)+66=0
We get rid of parentheses
-11d+66=0
We move all terms containing d to the left, all other terms to the right
-11d=-66
d=-66/-11
d=+6
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