56=20+9d

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Solution for 56=20+9d equation: 



56=20+9d

We move all terms to the left:

56-(20+9d)=0

We add all the numbers together, and all the variables

-(9d+20)+56=0

We get rid of parentheses

-9d-20+56=0

We add all the numbers together, and all the variables

-9d+36=0

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

-9d=-36

d=-36/-9

d=+4

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