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X^2+(5*x)/2-(19/8) = 0
X^2+(5*x)/2-19/8 = 0
X^2+5/2*x-19/8 = 0 // - X^2-19/8
5/2*x = -(X^2-19/8) // : 5/2
x = (-(X^2-19/8))/5/2
x = 2/5*(19/8-X^2)
x = 2/5*(19/8-X^2)
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