10=k+4.2

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Solution for 10=k+4.2 equation: 



10=k+4.2

We move all terms to the left:

10-(k+4.2)=0

We get rid of parentheses

-k-4.2+10=0

We add all the numbers together, and all the variables

-1k+5.8=0

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

-k=-5.8

k=-5.8/-1

k=5+0.8/1

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