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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