-2k+5k=-21

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Solution for -2k+5k=-21 equation: 



-2k+5k=-21

We move all terms to the left:

-2k+5k-(-21)=0

We add all the numbers together, and all the variables

3k+21=0

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

3k=-21

k=-21/3

k=-7

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