d-9=-3d-1

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Solution for d-9=-3d-1 equation: 



d-9=-3d-1

We move all terms to the left:

d-9-(-3d-1)=0

We get rid of parentheses

d+3d+1-9=0

We add all the numbers together, and all the variables

4d-8=0

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

4d=8

d=8/4

d=2

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