84=5u+9

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Solution for 84=5u+9 equation: 



84=5u+9

We move all terms to the left:

84-(5u+9)=0

We get rid of parentheses

-5u-9+84=0

We add all the numbers together, and all the variables

-5u+75=0

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

-5u=-75

u=-75/-5

u=+15

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