8d+21=12d+5d=

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Solution for 8d+21=12d+5d= equation: 



8d+21=12d+5d=

We move all terms to the left:

8d+21-(12d+5d)=0

We add all the numbers together, and all the variables

8d-(+17d)+21=0

We get rid of parentheses

8d-17d+21=0

We add all the numbers together, and all the variables

-9d+21=0

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

-9d=-21

d=-21/-9

d=2+1/3

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