81=3x+6x+9

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Solution for 81=3x+6x+9 equation: 



81=3x+6x+9

We move all terms to the left:

81-(3x+6x+9)=0

We add all the numbers together, and all the variables

-(9x+9)+81=0

We get rid of parentheses

-9x-9+81=0

We add all the numbers together, and all the variables

-9x+72=0

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

-9x=-72

x=-72/-9

x=+8

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