7u+4=81

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Solution for 7u+4=81 equation: 



7u+4=81

We move all terms to the left:

7u+4-(81)=0

We add all the numbers together, and all the variables

7u-77=0

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

7u=77

u=77/7

u=11

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