9=x+81

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Solution for 9=x+81 equation: 



9=x+81

We move all terms to the left:

9-(x+81)=0

We get rid of parentheses

-x-81+9=0

We add all the numbers together, and all the variables

-1x-72=0

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

-x=72

x=72/-1

x=-72

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