50=90-x

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Solution for 50=90-x equation: 



50=90-x

We move all terms to the left:

50-(90-x)=0

We add all the numbers together, and all the variables

-(-1x+90)+50=0

We get rid of parentheses

1x-90+50=0

We add all the numbers together, and all the variables

x-40=0

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

x=40

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