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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/y = (2/9)*y-7 // - (2/9)*y-7
1/y-((2/9)*y)+7 = 0
(-2/9)*y+1/y+7 = 0
1*y^-1-2/9*y^1+7*y^0 = 0
(7*y^1-2/9*y^2+1*y^0)/(y^1) = 0 // * y^2
y^1*(7*y^1-2/9*y^2+1*y^0) = 0
y^1
(-2/9)*y^2+7*y+1 = 0
(-2/9)*y^2+7*y+1 = 0
DELTA = 7^2-(1*4*(-2/9))
DELTA = 449/9
DELTA > 0
y = ((449/9)^(1/2)-7)/(2*(-2/9)) or y = (-(449/9)^(1/2)-7)/(2*(-2/9))
y = -9/4*((449/9)^(1/2)-7) or y = 9/4*((449/9)^(1/2)+7)
y in { -9/4*((449/9)^(1/2)-7), 9/4*((449/9)^(1/2)+7)}
y in { -9/4*((449/9)^(1/2)-7), 9/4*((449/9)^(1/2)+7) }
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