80=91-x

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Solution for 80=91-x equation: 



80=91-x

We move all terms to the left:

80-(91-x)=0

We add all the numbers together, and all the variables

-(-1x+91)+80=0

We get rid of parentheses

1x-91+80=0

We add all the numbers together, and all the variables

x-11=0

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

x=11

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