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D( Y )
Y = 0
Y = 0
Y = 0
Y in (-oo:0) U (0:+oo)
3/Y-((3/7)*Y) = 5 // - 5
3/Y-((3/7)*Y)-5 = 0
(-3/7)*Y+3/Y-5 = 0
3*Y^-1-3/7*Y^1-5*Y^0 = 0
(3*Y^0-3/7*Y^2-5*Y^1)/(Y^1) = 0 // * Y^2
Y^1*(3*Y^0-3/7*Y^2-5*Y^1) = 0
Y^1
(-3/7)*Y^2-5*Y+3 = 0
(-3/7)*Y^2-5*Y+3 = 0
DELTA = (-5)^2-(3*4*(-3/7))
DELTA = 211/7
DELTA > 0
Y = ((211/7)^(1/2)+5)/(2*(-3/7)) or Y = (5-(211/7)^(1/2))/(2*(-3/7))
Y = -7/6*((211/7)^(1/2)+5) or Y = -7/6*(5-(211/7)^(1/2))
Y in { -7/6*((211/7)^(1/2)+5), -7/6*(5-(211/7)^(1/2))}
Y in { -7/6*((211/7)^(1/2)+5), -7/6*(5-(211/7)^(1/2)) }
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