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-0.8=d+1
We move all terms to the left:
-0.8-(d+1)=0
We get rid of parentheses
-d-1-0.8=0
We add all the numbers together, and all the variables
-1d-1.8=0
We move all terms containing d to the left, all other terms to the right
-d=1.8
d=1.8/-1
d=-1+0.8/1
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