9u-15=12

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Solution for 9u-15=12 equation: 



9u-15=12

We move all terms to the left:

9u-15-(12)=0

We add all the numbers together, and all the variables

9u-27=0

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

9u=27

u=27/9

u=3

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