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 add all the numbers together, and all the variables

-1x+90=0

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

-x=-90

x=-90/-1

x=+90

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