7-9d=-8d

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



7-9d=-8d

We move all terms to the left:

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

We get rid of parentheses

-9d+8d+7=0

We add all the numbers together, and all the variables

-1d+7=0

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

-d=-7

d=-7/-1

d=+7

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