42-3u=30

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Solution for 42-3u=30 equation: 



42-3u=30

We move all terms to the left:

42-3u-(30)=0

We add all the numbers together, and all the variables

-3u+12=0

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

-3u=-12

u=-12/-3

u=+4

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