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-8.5-9(1-5.5d)=-25.5
We move all terms to the left:
-8.5-9(1-5.5d)-(-25.5)=0
We add all the numbers together, and all the variables
-9(-5.5d+1)-8.5-(-25.5)=0
We add all the numbers together, and all the variables
-9(-5.5d+1)+17=0
We multiply parentheses
45d-9+17=0
We add all the numbers together, and all the variables
45d+8=0
We move all terms containing d to the left, all other terms to the right
45d=-8
d=-8/45
d=-8/45
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