7=d-9

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Solution for 7=d-9 equation: 



7=d-9

We move all terms to the left:

7-(d-9)=0

We get rid of parentheses

-d+9+7=0

We add all the numbers together, and all the variables

-1d+16=0

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

-d=-16

d=-16/-1

d=+16

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