-x-3=81

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Solution for -x-3=81 equation: 



-x-3=81

We move all terms to the left:

-x-3-(81)=0

We add all the numbers together, and all the variables

-1x-84=0

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

-x=84

x=84/-1

x=-84

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