3u+15=42

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Solution for 3u+15=42 equation: 



3u+15=42

We move all terms to the left:

3u+15-(42)=0

We add all the numbers together, and all the variables

3u-27=0

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

3u=27

u=27/3

u=9

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