-1=7-d

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Solution for -1=7-d equation: 



-1=7-d

We move all terms to the left:

-1-(7-d)=0

We add all the numbers together, and all the variables

-(-1d+7)-1=0

We get rid of parentheses

1d-7-1=0

We add all the numbers together, and all the variables

d-8=0

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

d=8

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