-91=7(1+2k)

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Solution for -91=7(1+2k) equation: 



-91=7(1+2k)

We move all terms to the left:

-91-(7(1+2k))=0

We add all the numbers together, and all the variables

-(7(2k+1))-91=0



We calculate terms in parentheses: -(7(2k+1)), so:

7(2k+1)

We multiply parentheses

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-98=0

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

-14k=98

k=98/-14

k=-7

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