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-5.5(2.5d+7.5)=20.5
We move all terms to the left:
-5.5(2.5d+7.5)-(20.5)=0
We add all the numbers together, and all the variables
-5.5(2.5d+7.5)-20.5=0
We multiply parentheses
-11d-41.25-20.5=0
We add all the numbers together, and all the variables
-11d-61.75=0
We move all terms containing d to the left, all other terms to the right
-11d=61.75
d=61.75/-11
d=-5+3.85714285714/6.28571428571
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