42k+21=30

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Solution for 42k+21=30 equation: 



42k+21=30

We move all terms to the left:

42k+21-(30)=0

We add all the numbers together, and all the variables

42k-9=0

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

42k=9

k=9/42

k=3/14

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