-81=7k+3k

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Solution for -81=7k+3k equation: 



-81=7k+3k

We move all terms to the left:

-81-(7k+3k)=0

We add all the numbers together, and all the variables

-(+10k)-81=0

We get rid of parentheses

-10k-81=0

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

-10k=81

k=81/-10

k=-8+1/10

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