31=u/3+9

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Solution for 31=u/3+9 equation: 



31=u/3+9

We move all terms to the left:

31-(u/3+9)=0

We get rid of parentheses

-u/3-9+31=0

We multiply all the terms by the denominator


-u-9*3+31*3=0

We add all the numbers together, and all the variables

-1u+66=0

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

-u=-66

u=-66/-1

u=+66

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