12u=15+9u

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Solution for 12u=15+9u equation: 



12u=15+9u

We move all terms to the left:

12u-(15+9u)=0

We add all the numbers together, and all the variables

12u-(9u+15)=0

We get rid of parentheses

12u-9u-15=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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