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8.8=d+1
We move all terms to the left:
8.8-(d+1)=0
We get rid of parentheses
-d-1+8.8=0
We add all the numbers together, and all the variables
-1d+7.8=0
We move all terms containing d to the left, all other terms to the right
-d=-7.8
d=-7.8/-1
d=7+0.8/1
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