12=3(d+1)

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Solution for 12=3(d+1) equation: 



12=3(d+1)

We move all terms to the left:

12-(3(d+1))=0



We calculate terms in parentheses: -(3(d+1)), so:

3(d+1)

We multiply parentheses

3d+3

Back to the equation:

-(3d+3)



We get rid of parentheses

-3d-3+12=0

We add all the numbers together, and all the variables

-3d+9=0

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

-3d=-9

d=-9/-3

d=+3

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