9=15-2k

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Solution for 9=15-2k equation: 



9=15-2k

We move all terms to the left:

9-(15-2k)=0

We add all the numbers together, and all the variables

-(-2k+15)+9=0

We get rid of parentheses

2k-15+9=0

We add all the numbers together, and all the variables

2k-6=0

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

2k=6

k=6/2

k=3

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