3u+12=42

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Solution for 3u+12=42 equation: 



3u+12=42

We move all terms to the left:

3u+12-(42)=0

We add all the numbers together, and all the variables

3u-30=0

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

3u=30

u=30/3

u=10

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