-80=5k+3k

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Solution for -80=5k+3k equation: 



-80=5k+3k

We move all terms to the left:

-80-(5k+3k)=0

We add all the numbers together, and all the variables

-(+8k)-80=0

We get rid of parentheses

-8k-80=0

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

-8k=80

k=80/-8

k=-10

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