-15=2k+5k

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Solution for -15=2k+5k equation: 



-15=2k+5k

We move all terms to the left:

-15-(2k+5k)=0

We add all the numbers together, and all the variables

-(+7k)-15=0

We get rid of parentheses

-7k-15=0

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

-7k=15

k=15/-7

k=-2+1/7

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