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X^2+5*x-(11/4) = 0
X^2+5*x-11/4 = 0
X^2+5*x-11/4 = 0 // - X^2-11/4
5*x = -(X^2-11/4) // : 5
x = (-(X^2-11/4))/5
x = (11/4-X^2)/5
x = (11/4-X^2)/5
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