81-11u=4

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Solution for 81-11u=4 equation: 



81-11u=4

We move all terms to the left:

81-11u-(4)=0

We add all the numbers together, and all the variables

-11u+77=0

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

-11u=-77

u=-77/-11

u=+7

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