-d-8=-9d

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Solution for -d-8=-9d equation: 



-d-8=-9d

We move all terms to the left:

-d-8-(-9d)=0

We add all the numbers together, and all the variables

-1d-(-9d)-8=0

We get rid of parentheses

-1d+9d-8=0

We add all the numbers together, and all the variables

8d-8=0

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

8d=8

d=8/8

d=1

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