81-12u=-2u+31

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Solution for 81-12u=-2u+31 equation: 



81-12u=-2u+31

We move all terms to the left:

81-12u-(-2u+31)=0

We get rid of parentheses

-12u+2u-31+81=0

We add all the numbers together, and all the variables

-10u+50=0

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

-10u=-50

u=-50/-10

u=+5

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