90=171-x

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Solution for 90=171-x equation: 



90=171-x

We move all terms to the left:

90-(171-x)=0

We add all the numbers together, and all the variables

-(-1x+171)+90=0

We get rid of parentheses

1x-171+90=0

We add all the numbers together, and all the variables

x-81=0

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

x=81

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