(3-y)^2-y(y+2.5)=9

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Solution for (3-y)^2-y(y+2.5)=9 equation: 



(3-y)^2-y(y+2.5)=9

We move all terms to the left:

(3-y)^2-y(y+2.5)-(9)=0

We add all the numbers together, and all the variables

(-1y+3)^2-y(y+2.5)-9=0

We multiply parentheses

-y^2+(-1y+3)^2-2.5y-9=0

We add all the numbers together, and all the variables

-1y^2-2.5y+(-1y+3)^2-9=0

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

-1y^2-2.5y+(-1y+3)^2=9

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