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-5.1d=-7.74+3.5d
We move all terms to the left:
-5.1d-(-7.74+3.5d)=0
We add all the numbers together, and all the variables
-5.1d-(3.5d-7.74)=0
We get rid of parentheses
-5.1d-3.5d+7.74=0
We add all the numbers together, and all the variables
-8.6d+7.74=0
We move all terms containing d to the left, all other terms to the right
-8.6d=-7.74
d=-7.74/-8.6
d=4.448275862069/4.9425287356322
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