3+3u=15

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Solution for 3+3u=15 equation: 



3+3u=15

We move all terms to the left:

3+3u-(15)=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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