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Y in (-oo:+oo)
Y = (Y^2)/7 // - (Y^2)/7
Y-((Y^2)/7) = 0
Y-1/7*Y^2 = 0
DELTA = 1^2-(-1/7*0*4)
DELTA = 1
DELTA > 0
Y = (1^(1/2)-1)/(-1/7*2) or Y = (-1^(1/2)-1)/(-1/7*2)
Y = 0 or Y = 7
Y in { 0, 7 }
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