7d-1=-9+8d

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Solution for 7d-1=-9+8d equation: 



7d-1=-9+8d

We move all terms to the left:

7d-1-(-9+8d)=0

We add all the numbers together, and all the variables

7d-(8d-9)-1=0

We get rid of parentheses

7d-8d+9-1=0

We add all the numbers together, and all the variables

-1d+8=0

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

-d=-8

d=-8/-1

d=+8

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