u=2u-84

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Solution for u=2u-84 equation: 



u=2u-84

We move all terms to the left:

u-(2u-84)=0

We get rid of parentheses

u-2u+84=0

We add all the numbers together, and all the variables

-1u+84=0

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

-u=-84

u=-84/-1

u=+84

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