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9d-7=7d-11
We move all terms to the left:
9d-7-(7d-11)=0
We get rid of parentheses
9d-7d+11-7=0
We add all the numbers together, and all the variables
2d+4=0
We move all terms containing d to the left, all other terms to the right
2d=-4
d=-4/2
d=-2
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