1-7d=9-9d

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



1-7d=9-9d

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-7d+9d-9+1=0

We add all the numbers together, and all the variables

2d-8=0

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

2d=8

d=8/2

d=4

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