42=9+3d

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Solution for 42=9+3d equation: 



42=9+3d

We move all terms to the left:

42-(9+3d)=0

We add all the numbers together, and all the variables

-(3d+9)+42=0

We get rid of parentheses

-3d-9+42=0

We add all the numbers together, and all the variables

-3d+33=0

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

-3d=-33

d=-33/-3

d=+11

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