-9=k-1

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Solution for -9=k-1 equation: 



-9=k-1

We move all terms to the left:

-9-(k-1)=0

We get rid of parentheses

-k+1-9=0

We add all the numbers together, and all the variables

-1k-8=0

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

-k=8

k=8/-1

k=-8

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