4d-12=30

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Solution for 4d-12=30 equation: 



4d-12=30

We move all terms to the left:

4d-12-(30)=0

We add all the numbers together, and all the variables

4d-42=0

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

4d=42

d=42/4

d=10+1/2

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