-12+9d=42

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Solution for -12+9d=42 equation: 



-12+9d=42

We move all terms to the left:

-12+9d-(42)=0

We add all the numbers together, and all the variables

9d-54=0

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

9d=54

d=54/9

d=6

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