-9=7+d

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Solution for -9=7+d equation: 



-9=7+d

We move all terms to the left:

-9-(7+d)=0

We add all the numbers together, and all the variables

-(d+7)-9=0

We get rid of parentheses

-d-7-9=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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