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X^2+(7*x)/2-(11/8) = 0
X^2+(7*x)/2-11/8 = 0
X^2+7/2*x-11/8 = 0 // - X^2-11/8
7/2*x = -(X^2-11/8) // : 7/2
x = (-(X^2-11/8))/7/2
x = 2/7*(11/8-X^2)
x = 2/7*(11/8-X^2)
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