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+21-4Y)=0

We add all the numbers together, and all the variables

-(-1Y+28)=0

We get rid of parentheses

1Y-28=0

We add all the numbers together, and all the variables

Y-28=0

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

Y=28

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