9=12-5u

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Solution for 9=12-5u equation: 



9=12-5u

We move all terms to the left:

9-(12-5u)=0

We add all the numbers together, and all the variables

-(-5u+12)+9=0

We get rid of parentheses

5u-12+9=0

We add all the numbers together, and all the variables

5u-3=0

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

5u=3

u=3/5

u=3/5

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