40=k+28

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Solution for 40=k+28 equation: 



40=k+28

We move all terms to the left:

40-(k+28)=0

We get rid of parentheses

-k-28+40=0

We add all the numbers together, and all the variables

-1k+12=0

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

-k=-12

k=-12/-1

k=+12

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