-9=-8+k

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Solution for -9=-8+k equation: 



-9=-8+k

We move all terms to the left:

-9-(-8+k)=0

We add all the numbers together, and all the variables

-(k-8)-9=0

We get rid of parentheses

-k+8-9=0

We add all the numbers together, and all the variables

-1k-1=0

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

-k=1

k=1/-1

k=-1

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