Y-y+3y+y-y=9

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Solution for Y-y+3y+y-y=9 equation: 



-Y+3Y+Y-Y=9

We move all terms to the left:

-Y+3Y+Y-Y-(9)=0

We add all the numbers together, and all the variables

2Y-9=0

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

2Y=9

Y=9/2

Y=4+1/2

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