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-57=0

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

3u=57

u=57/3

u=19

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