80x=9-x

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Solution for 80x=9-x equation: 



80x=9-x

We move all terms to the left:

80x-(9-x)=0

We add all the numbers together, and all the variables

80x-(-1x+9)=0

We get rid of parentheses

80x+1x-9=0

We add all the numbers together, and all the variables

81x-9=0

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

81x=9

x=9/81

x=1/9

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