7d=8+9d

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Solution for 7d=8+9d equation: 



7d=8+9d

We move all terms to the left:

7d-(8+9d)=0

We add all the numbers together, and all the variables

7d-(9d+8)=0

We get rid of parentheses

7d-9d-8=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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