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-9d-6d-(-13d)+-6d=-8
We move all terms to the left:
-9d-6d-(-13d)+-6d-(-8)=0
We add all the numbers together, and all the variables
-21d-(-13d)+8=0
We get rid of parentheses
-21d+13d+8=0
We add all the numbers together, and all the variables
-8d+8=0
We move all terms containing d to the left, all other terms to the right
-8d=-8
d=-8/-8
d=1
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