15=12u-9u

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Solution for 15=12u-9u equation: 



15=12u-9u

We move all terms to the left:

15-(12u-9u)=0

We add all the numbers together, and all the variables

-(+3u)+15=0

We get rid of parentheses

-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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