Y=490-2x

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Solution for Y=490-2x equation: 



=490-2Y

We move all terms to the left:

-(490-2Y)=0

We add all the numbers together, and all the variables

-(-2Y+490)=0

We get rid of parentheses

2Y-490=0

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

2Y=490

Y=490/2

Y=245

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