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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x-5-1 = 6/(x^2)-1 // - 6/(x^2)-1
7/x-(6/(x^2))-5-1+1 = 0
7/x-6*x^-2-5-1+1 = 0
7*x^-1-6*x^-2-5 = 0
t_1 = x^-1
7*t_1^1-6*t_1^2-5 = 0
7*t_1-6*t_1^2-5 = 0
DELTA = 7^2-(-6*(-5)*4)
DELTA = -71
DELTA < 0
x belongs to the empty set
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