-9-7d=1+3d

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Solution for -9-7d=1+3d equation: 



-9-7d=1+3d

We move all terms to the left:

-9-7d-(1+3d)=0

We add all the numbers together, and all the variables

-7d-(3d+1)-9=0

We get rid of parentheses

-7d-3d-1-9=0

We add all the numbers together, and all the variables

-10d-10=0

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

-10d=10

d=10/-10

d=-1

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