-7+d=-7-7d

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



-7+d=-7-7d

We move all terms to the left:

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

We add all the numbers together, and all the variables

d-(-7d-7)-7=0

We get rid of parentheses

d+7d+7-7=0

We add all the numbers together, and all the variables

8d=0

d=0/8

d=0

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