-90=6k+6(-1+k)

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Solution for -90=6k+6(-1+k) equation: 



-90=6k+6(-1+k)

We move all terms to the left:

-90-(6k+6(-1+k))=0

We add all the numbers together, and all the variables

-(6k+6(k-1))-90=0



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

6k+6(k-1)

We multiply parentheses

6k+6k-6

We add all the numbers together, and all the variables

12k-6

Back to the equation:

-(12k-6)



We get rid of parentheses

-12k+6-90=0

We add all the numbers together, and all the variables

-12k-84=0

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

-12k=84

k=84/-12

k=-7

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