81=-8x+9

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Solution for 81=-8x+9 equation: 



81=-8x+9

We move all terms to the left:

81-(-8x+9)=0

We get rid of parentheses

8x-9+81=0

We add all the numbers together, and all the variables

8x+72=0

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

8x=-72

x=-72/8

x=-9

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