8+4d=9d-7

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Solution for 8+4d=9d-7 equation: 



8+4d=9d-7

We move all terms to the left:

8+4d-(9d-7)=0

We get rid of parentheses

4d-9d+7+8=0

We add all the numbers together, and all the variables

-5d+15=0

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

-5d=-15

d=-15/-5

d=+3

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