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X^2 = 9/5-x // - 9/5-x
X^2+x-(9/5) = 0
X^2+x-9/5 = 0
X^2+x-9/5 = 0 // - X^2-9/5
x = -(X^2-9/5)
x = 9/5-X^2
x = 9/5-X^2
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