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-8d-10=9-4d+9
We move all terms to the left:
-8d-10-(9-4d+9)=0
We add all the numbers together, and all the variables
-8d-(-4d+18)-10=0
We get rid of parentheses
-8d+4d-18-10=0
We add all the numbers together, and all the variables
-4d-28=0
We move all terms containing d to the left, all other terms to the right
-4d=28
d=28/-4
d=-7
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