-91=7(k-1)+7k

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Solution for -91=7(k-1)+7k equation: 



-91=7(k-1)+7k

We move all terms to the left:

-91-(7(k-1)+7k)=0



We calculate terms in parentheses: -(7(k-1)+7k), so:

7(k-1)+7k

We add all the numbers together, and all the variables

7k+7(k-1)

We multiply parentheses

7k+7k-7

We add all the numbers together, and all the variables

14k-7

Back to the equation:

-(14k-7)



We get rid of parentheses

-14k+7-91=0

We add all the numbers together, and all the variables

-14k-84=0

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

-14k=84

k=84/-14

k=-6

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