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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