d+3.9=13.2

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Solution for d+3.9=13.2 equation: 



d+3.9=13.2

We move all terms to the left:

d+3.9-(13.2)=0

We add all the numbers together, and all the variables

d-9.3=0

We move all terms containing d to the left, all other terms to the right

d=9.3

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