13u=81+4u

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Solution for 13u=81+4u equation: 



13u=81+4u

We move all terms to the left:

13u-(81+4u)=0

We add all the numbers together, and all the variables

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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