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x^2 -9x+81/4 - 81/4 -2 =0
(x-9/2)^2 -81/4 -2 =0
(x-9/2)^2 = 89/4
(x-9/2) = +-√89/2
x = (9+-√89)/2
x1 = (9+√89)/2
x2 = (9-√89)/2