13u=12+9u

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Solution for 13u=12+9u equation: 



13u=12+9u

We move all terms to the left:

13u-(12+9u)=0

We add all the numbers together, and all the variables

13u-(9u+12)=0

We get rid of parentheses

13u-9u-12=0

We add all the numbers together, and all the variables

4u-12=0

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

4u=12

u=12/4

u=3

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