3(d-1)=9

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Solution for 3(d-1)=9 equation: 



3(d-1)=9

We move all terms to the left:

3(d-1)-(9)=0

We multiply parentheses

3d-3-9=0

We add all the numbers together, and all the variables

3d-12=0

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

3d=12

d=12/3

d=4

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