9+3k=2k+-12

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Solution for 9+3k=2k+-12 equation: 



9+3k=2k+-12

We move all terms to the left:

9+3k-(2k+-12)=0

We add all the numbers together, and all the variables

3k-(2k-12)+9=0

We get rid of parentheses

3k-2k+12+9=0

We add all the numbers together, and all the variables

k+21=0

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

k=-21

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