131=221-x

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Solution for 131=221-x equation: 



131=221-x

We move all terms to the left:

131-(221-x)=0

We add all the numbers together, and all the variables

-(-1x+221)+131=0

We get rid of parentheses

1x-221+131=0

We add all the numbers together, and all the variables

x-90=0

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

x=90

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