-15=2k+3k

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Solution for -15=2k+3k equation: 



-15=2k+3k

We move all terms to the left:

-15-(2k+3k)=0

We add all the numbers together, and all the variables

-(+5k)-15=0

We get rid of parentheses

-5k-15=0

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

-5k=15

k=15/-5

k=-3

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