15=4k-k

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Solution for 15=4k-k equation: 



15=4k-k

We move all terms to the left:

15-(4k-k)=0

We add all the numbers together, and all the variables

-(+3k)+15=0

We get rid of parentheses

-3k+15=0

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

-3k=-15

k=-15/-3

k=+5

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