k+2k=15

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Solution for k+2k=15 equation: 



k+2k=15

We move all terms to the left:

k+2k-(15)=0

We add all the numbers together, and all the variables

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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