9=3(-1+k)

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Solution for 9=3(-1+k) equation: 



9=3(-1+k)

We move all terms to the left:

9-(3(-1+k))=0

We add all the numbers together, and all the variables

-(3(k-1))+9=0



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

3(k-1)

We multiply parentheses

3k-3

Back to the equation:

-(3k-3)



We get rid of parentheses

-3k+3+9=0

We add all the numbers together, and all the variables

-3k+12=0

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

-3k=-12

k=-12/-3

k=+4

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