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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7*x+1 = 6/x // - 6/x
7*x-(6/x)+1 = 0
7*x-6*x^-1+1 = 0
7*x^1-6*x^-1+1*x^0 = 0
(7*x^2+1*x^1-6*x^0)/(x^1) = 0 // * x^2
x^1*(7*x^2+1*x^1-6*x^0) = 0
x^1
7*x^2+x-6 = 0
7*x^2+x-6 = 0
DELTA = 1^2-(-6*4*7)
DELTA = 169
DELTA > 0
x = (169^(1/2)-1)/(2*7) or x = (-169^(1/2)-1)/(2*7)
x = 6/7 or x = -1
x in { -1, 6/7}
x in { -1, 6/7 }
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