15=d+6(d-1)

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Solution for 15=d+6(d-1) equation: 



15=d+6(d-1)

We move all terms to the left:

15-(d+6(d-1))=0



We calculate terms in parentheses: -(d+6(d-1)), so:

d+6(d-1)

We multiply parentheses

d+6d-6

We add all the numbers together, and all the variables

7d-6

Back to the equation:

-(7d-6)



We get rid of parentheses

-7d+6+15=0

We add all the numbers together, and all the variables

-7d+21=0

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

-7d=-21

d=-21/-7

d=+3

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