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X^2-(9*x)-(19/4) = 0
X^2-9*x-19/4 = 0
X^2-9*x-19/4 = 0 // - X^2-19/4
-9*x = -(X^2-19/4) // : -9
x = (-(X^2-19/4))/(-9)
x = (19/4-X^2)/(-9)
x = (19/4-X^2)/(-9)
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