15u=81+6u

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Solution for 15u=81+6u equation: 



15u=81+6u

We move all terms to the left:

15u-(81+6u)=0

We add all the numbers together, and all the variables

15u-(6u+81)=0

We get rid of parentheses

15u-6u-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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