91=7(k-77)

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Solution for 91=7(k-77) equation: 



91=7(k-77)

We move all terms to the left:

91-(7(k-77))=0



We calculate terms in parentheses: -(7(k-77)), so:

7(k-77)

We multiply parentheses

7k-539

Back to the equation:

-(7k-539)



We get rid of parentheses

-7k+539+91=0

We add all the numbers together, and all the variables

-7k+630=0

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

-7k=-630

k=-630/-7

k=+90

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