15+3u=6

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Solution for 15+3u=6 equation: 



15+3u=6

We move all terms to the left:

15+3u-(6)=0

We add all the numbers together, and all the variables

3u+9=0

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

3u=-9

u=-9/3

u=-3

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