81=5x-9

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Solution for 81=5x-9 equation: 



81=5x-9

We move all terms to the left:

81-(5x-9)=0

We get rid of parentheses

-5x+9+81=0

We add all the numbers together, and all the variables

-5x+90=0

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

-5x=-90

x=-90/-5

x=+18

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