12+3u=54

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Solution for 12+3u=54 equation: 



12+3u=54

We move all terms to the left:

12+3u-(54)=0

We add all the numbers together, and all the variables

3u-42=0

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

3u=42

u=42/3

u=14

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