21=-9d+8d

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Solution for 21=-9d+8d equation: 



21=-9d+8d

We move all terms to the left:

21-(-9d+8d)=0

We add all the numbers together, and all the variables

-(-1d)+21=0

We get rid of parentheses

1d+21=0

We add all the numbers together, and all the variables

d+21=0

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

d=-21

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