13u=4u+81

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Solution for 13u=4u+81 equation: 



13u=4u+81

We move all terms to the left:

13u-(4u+81)=0

We get rid of parentheses

13u-4u-81=0

We add all the numbers together, and all the variables

9u-81=0

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

9u=81

u=81/9

u=9

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