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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = (16/9)*x+7 // - (16/9)*x+7
1/x-((16/9)*x)-7 = 0
(-16/9)*x+1/x-7 = 0
1*x^-1-16/9*x^1-7*x^0 = 0
(1*x^0-16/9*x^2-7*x^1)/(x^1) = 0 // * x^2
x^1*(1*x^0-16/9*x^2-7*x^1) = 0
x^1
(-16/9)*x^2-7*x+1 = 0
(-16/9)*x^2-7*x+1 = 0
DELTA = (-7)^2-(1*4*(-16/9))
DELTA = 505/9
DELTA > 0
x = ((505/9)^(1/2)+7)/(2*(-16/9)) or x = (7-(505/9)^(1/2))/(2*(-16/9))
x = -9/32*((505/9)^(1/2)+7) or x = -9/32*(7-(505/9)^(1/2))
x in { -9/32*((505/9)^(1/2)+7), -9/32*(7-(505/9)^(1/2))}
x in { -9/32*((505/9)^(1/2)+7), -9/32*(7-(505/9)^(1/2)) }
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