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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(5/2)*y = 7/y-3 // - 7/y-3
(5/2)*y-(7/y)+3 = 0
(5/2)*y-7*y^-1+3 = 0
5/2*y^1-7*y^-1+3*y^0 = 0
(5/2*y^2+3*y^1-7*y^0)/(y^1) = 0 // * y^2
y^1*(5/2*y^2+3*y^1-7*y^0) = 0
y^1
(5/2)*y^2+3*y-7 = 0
(5/2)*y^2+3*y-7 = 0
DELTA = 3^2-(-7*4*(5/2))
DELTA = 79
DELTA > 0
y = (79^(1/2)-3)/(2*(5/2)) or y = (-79^(1/2)-3)/(2*(5/2))
y = (79^(1/2)-3)/5 or y = (-(79^(1/2)+3))/5
y in { (-(79^(1/2)+3))/5, (79^(1/2)-3)/5}
y in { (-(79^(1/2)+3))/5, (79^(1/2)-3)/5 }
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