x+84=2x+81

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Solution for x+84=2x+81 equation: 



x+84=2x+81

We move all terms to the left:

x+84-(2x+81)=0

We get rid of parentheses

x-2x-81+84=0

We add all the numbers together, and all the variables

-1x+3=0

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

-x=-3

x=-3/-1

x=+3

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