12-4k=40

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Solution for 12-4k=40 equation: 



12-4k=40

We move all terms to the left:

12-4k-(40)=0

We add all the numbers together, and all the variables

-4k-28=0

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

-4k=28

k=28/-4

k=-7

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