3.0d+7.9=9.1

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Solution for 3.0d+7.9=9.1 equation: 



3.0d+7.9=9.1

We move all terms to the left:

3.0d+7.9-(9.1)=0

We add all the numbers together, and all the variables

3.0d-1.2=0

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

3.0d=1.2

d=1.2/3.0

d=1/2.5

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