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x in (-oo:+oo)
((2*x)/4)*x+1+15 = 5/2 // - 5/2
((2*x)/4)*x-(5/2)+1+15 = 0
((2*x)/4)*x-5/2+1+15 = 0
1/2*x^2 = -27/2 // : 1/2
x^2 = -27
x belongs to the empty set
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