9d+1=8d-21

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Solution for 9d+1=8d-21 equation: 



9d+1=8d-21

We move all terms to the left:

9d+1-(8d-21)=0

We get rid of parentheses

9d-8d+21+1=0

We add all the numbers together, and all the variables

d+22=0

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

d=-22

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