3(d-7)=d+9

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Solution for 3(d-7)=d+9 equation: 



3(d-7)=d+9

We move all terms to the left:

3(d-7)-(d+9)=0

We multiply parentheses

3d-(d+9)-21=0

We get rid of parentheses

3d-d-9-21=0

We add all the numbers together, and all the variables

2d-30=0

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

2d=30

d=30/2

d=15

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