3=9-2d

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Solution for 3=9-2d equation: 



3=9-2d

We move all terms to the left:

3-(9-2d)=0

We add all the numbers together, and all the variables

-(-2d+9)+3=0

We get rid of parentheses

2d-9+3=0

We add all the numbers together, and all the variables

2d-6=0

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

2d=6

d=6/2

d=3

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