7d=8d-9

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Solution for 7d=8d-9 equation: 



7d=8d-9

We move all terms to the left:

7d-(8d-9)=0

We get rid of parentheses

7d-8d+9=0

We add all the numbers together, and all the variables

-1d+9=0

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

-d=-9

d=-9/-1

d=+9

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