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8=11-d
We move all terms to the left:
8-(11-d)=0
We add all the numbers together, and all the variables
-(-1d+11)+8=0
We get rid of parentheses
1d-11+8=0
We add all the numbers together, and all the variables
d-3=0
We move all terms containing d to the left, all other terms to the right
d=3
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