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x in (-oo:+oo)
2*x-(((4*x)/2)*x)+1/2-1 = -1 // + 1
2*x-(((4*x)/2)*x)+1/2-1+1 = 0
2*x-2*x^2+1/2-1+1 = 0
2*x-2*x^2+1/2 = 0
DELTA = 2^2-(-2*1/2*4)
DELTA = 8
DELTA > 0
x = (8^(1/2)-2)/(-2*2) or x = (-8^(1/2)-2)/(-2*2)
x = (2*2^(1/2)-2)/(-4) or x = (-2*2^(1/2)-2)/(-4)
x in { (2*2^(1/2)-2)/(-4), (-2*2^(1/2)-2)/(-4) }
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