-30=3(k-1)

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Solution for -30=3(k-1) equation: 



-30=3(k-1)

We move all terms to the left:

-30-(3(k-1))=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+3-30=0

We add all the numbers together, and all the variables

-3k-27=0

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

-3k=27

k=27/-3

k=-9

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