-7d+9=9-7d

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



-7d+9=9-7d

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-7d+7d-9+9=0

We add all the numbers together, and all the variables

=0

d=0/1

d=0

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