3d=7+4d

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Solution for 3d=7+4d equation: 



3d=7+4d

We move all terms to the left:

3d-(7+4d)=0

We add all the numbers together, and all the variables

3d-(4d+7)=0

We get rid of parentheses

3d-4d-7=0

We add all the numbers together, and all the variables

-1d-7=0

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

-d=7

d=7/-1

d=-7

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