15+9u=12u

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Solution for 15+9u=12u equation: 



15+9u=12u

We move all terms to the left:

15+9u-(12u)=0

We add all the numbers together, and all the variables

-3u+15=0

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

-3u=-15

u=-15/-3

u=+5

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