-d-8=10-8d+9d

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Solution for -d-8=10-8d+9d equation: 



-d-8=10-8d+9d

We move all terms to the left:

-d-8-(10-8d+9d)=0

We add all the numbers together, and all the variables

-d-(d+10)-8=0

We add all the numbers together, and all the variables

-1d-(d+10)-8=0

We get rid of parentheses

-1d-d-10-8=0

We add all the numbers together, and all the variables

-2d-18=0

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

-2d=18

d=18/-2

d=-9

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