-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-2=0

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

-d=2

d=2/-1

d=-2

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