90-x=90+x

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Solution for 90-x=90+x equation: 



90-x=90+x

We move all terms to the left:

90-x-(90+x)=0

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-1x-x-90+90=0

We add all the numbers together, and all the variables

-2x=0

x=0/-2

x=0

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