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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/y+2 = y/3 // - y/3
5/y-(y/3)+2 = 0
5*y^-1-1/3*y^1+2*y^0 = 0
(2*y^1-1/3*y^2+5*y^0)/(y^1) = 0 // * y^2
y^1*(2*y^1-1/3*y^2+5*y^0) = 0
y^1
(-1/3)*y^2+2*y+5 = 0
(-1/3)*y^2+2*y+5 = 0
DELTA = 2^2-(4*5*(-1/3))
DELTA = 32/3
DELTA > 0
y = ((32/3)^(1/2)-2)/(2*(-1/3)) or y = (-(32/3)^(1/2)-2)/(2*(-1/3))
y = -3/2*((32/3)^(1/2)-2) or y = 3/2*((32/3)^(1/2)+2)
y in { -3/2*((32/3)^(1/2)-2), 3/2*((32/3)^(1/2)+2)}
y in { -3/2*((32/3)^(1/2)-2), 3/2*((32/3)^(1/2)+2) }
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