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x in (-oo:+oo)
14-(((2*x)/4)*x) = 20 // - 20
14-(((2*x)/4)*x)-20 = 0
(-1/2)*x^2-20+14 = 0
-1/2*x^2 = 6 // : -1/2
x^2 = -12
x belongs to the empty set
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