72-x=81-2x

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Solution for 72-x=81-2x equation: 



72-x=81-2x

We move all terms to the left:

72-x-(81-2x)=0

We add all the numbers together, and all the variables

-x-(-2x+81)+72=0

We add all the numbers together, and all the variables

-1x-(-2x+81)+72=0

We get rid of parentheses

-1x+2x-81+72=0

We add all the numbers together, and all the variables

x-9=0

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

x=9

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