81-x=2x

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Solution for 81-x=2x equation: 



81-x=2x

We move all terms to the left:

81-x-(2x)=0

We add all the numbers together, and all the variables

-3x+81=0

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

-3x=-81

x=-81/-3

x=+27

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