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-10d=-9d-4
We move all terms to the left:
-10d-(-9d-4)=0
We get rid of parentheses
-10d+9d+4=0
We add all the numbers together, and all the variables
-1d+4=0
We move all terms containing d to the left, all other terms to the right
-d=-4
d=-4/-1
d=+4
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