7k+12=4k-9

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Solution for 7k+12=4k-9 equation: 



7k+12=4k-9

We move all terms to the left:

7k+12-(4k-9)=0

We get rid of parentheses

7k-4k+9+12=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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