90=8d+d

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Solution for 90=8d+d equation: 



90=8d+d

We move all terms to the left:

90-(8d+d)=0

We add all the numbers together, and all the variables

-(+9d)+90=0

We get rid of parentheses

-9d+90=0

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

-9d=-90

d=-90/-9

d=+10

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