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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(70/x) = -3 // + 3
x-(70/x)+3 = 0
x-70*x^-1+3 = 0
1*x^1-70*x^-1+3*x^0 = 0
(1*x^2+3*x^1-70*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+3*x^1-70*x^0) = 0
x^1
x^2+3*x-70 = 0
x^2+3*x-70 = 0
DELTA = 3^2-(-70*1*4)
DELTA = 289
DELTA > 0
x = (289^(1/2)-3)/(1*2) or x = (-289^(1/2)-3)/(1*2)
x = 7 or x = -10
x in { -10, 7}
x in { -10, 7 }
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