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9d+8-9d=-10-3d
We move all terms to the left:
9d+8-9d-(-10-3d)=0
We add all the numbers together, and all the variables
9d-9d-(-3d-10)+8=0
We add all the numbers together, and all the variables
-(-3d-10)+8=0
We get rid of parentheses
3d+10+8=0
We add all the numbers together, and all the variables
3d+18=0
We move all terms containing d to the left, all other terms to the right
3d=-18
d=-18/3
d=-6
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