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-7=9-2d
We move all terms to the left:
-7-(9-2d)=0
We add all the numbers together, and all the variables
-(-2d+9)-7=0
We get rid of parentheses
2d-9-7=0
We add all the numbers together, and all the variables
2d-16=0
We move all terms containing d to the left, all other terms to the right
2d=16
d=16/2
d=8
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