Y=8x-13x+21

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Solution for Y=8x-13x+21 equation: 



=8Y-13Y+21

We move all terms to the left:

-(8Y-13Y+21)=0

We add all the numbers together, and all the variables

-(-5Y+21)=0

We get rid of parentheses

5Y-21=0

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

5Y=21

Y=21/5

Y=4+1/5

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