Y=3x+7=21-4x

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Solution for Y=3x+7=21-4x equation: 



=3Y+7=21-4Y

We move all terms to the left:

-(3Y+7)=0

We get rid of parentheses

-3Y-7=0

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

-3Y=7

Y=7/-3

Y=-2+1/3

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