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X^2-(7*x)+14/4 = 0
X^2-7*x+14/4 = 0
X^2-7*x+7/2 = 0 // - X^2+7/2
-7*x = -(X^2+7/2) // : -7
x = (-(X^2+7/2))/(-7)
x = (X^2+7/2)/7
x = (X^2+7/2)/7
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