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D( y )
7*y = 0
7*y = 0
7*y = 0
7*y = 0 // : 7
y = 0
y in (-oo:0) U (0:+oo)
10/(7*y)-(13*70) = 1*2*y // - 1*2*y
10/(7*y)-(1*2*y)-(13*70) = 0
10/(7*y)-2*y-910 = 0
10/7*y^-1-2*y^1-910*y^0 = 0
(10/7*y^0-2*y^2-910*y^1)/(y^1) = 0 // * y^2
y^1*(10/7*y^0-2*y^2-910*y^1) = 0
y^1
10/7-2*y^2-910*y = 0
10/7-2*y^2-910*y = 0
DELTA = (-910)^2-(-2*4*(10/7))
DELTA = 5796780/7
DELTA > 0
y = ((5796780/7)^(1/2)+910)/(-2*2) or y = (910-(5796780/7)^(1/2))/(-2*2)
y = ((5796780/7)^(1/2)+910)/(-4) or y = (910-(5796780/7)^(1/2))/(-4)
y in { ((5796780/7)^(1/2)+910)/(-4), (910-(5796780/7)^(1/2))/(-4)}
y in { ((5796780/7)^(1/2)+910)/(-4), (910-(5796780/7)^(1/2))/(-4) }
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