-90=9d-9

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Solution for -90=9d-9 equation: 



-90=9d-9

We move all terms to the left:

-90-(9d-9)=0

We get rid of parentheses

-9d+9-90=0

We add all the numbers together, and all the variables

-9d-81=0

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

-9d=81

d=81/-9

d=-9

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