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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
7*y-(9/y) = 7/10 // - 7/10
7*y-(9/y)-(7/10) = 0
7*y-9*y^-1-7/10 = 0
7*y^1-9*y^-1-7/10*y^0 = 0
(7*y^2-7/10*y^1-9*y^0)/(y^1) = 0 // * y^2
y^1*(7*y^2-7/10*y^1-9*y^0) = 0
y^1
7*y^2+(-7/10)*y-9 = 0
7*y^2+(-7/10)*y-9 = 0
DELTA = (-7/10)^2-(-9*4*7)
DELTA = 25249/100
DELTA > 0
y = ((25249/100)^(1/2)-(-7/10))/(2*7) or y = (-(-7/10)-(25249/100)^(1/2))/(2*7)
y = ((25249/100)^(1/2)+7/10)/14 or y = (7/10-(25249/100)^(1/2))/14
y in { (7/10-(25249/100)^(1/2))/14, ((25249/100)^(1/2)+7/10)/14}
y in { (7/10-(25249/100)^(1/2))/14, ((25249/100)^(1/2)+7/10)/14 }
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