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-3.1d+15.5=9.3
We move all terms to the left:
-3.1d+15.5-(9.3)=0
We add all the numbers together, and all the variables
-3.1d+6.2=0
We move all terms containing d to the left, all other terms to the right
-3.1d=-6.2
d=-6.2/-3.1
d=+2
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