13.9-3d=7.9

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Solution for 13.9-3d=7.9 equation: 



13.9-3d=7.9

We move all terms to the left:

13.9-3d-(7.9)=0

We add all the numbers together, and all the variables

-3d+6=0

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

-3d=-6

d=-6/-3

d=+2

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