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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x+7 = (22/7)*x+6 // - (22/7)*x+6
4/x-((22/7)*x)-6+7 = 0
(-22/7)*x+4/x-6+7 = 0
4*x^-1-22/7*x^1+1*x^0 = 0
(1*x^1-22/7*x^2+4*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^1-22/7*x^2+4*x^0) = 0
x^1
(-22/7)*x^2+x+4 = 0
(-22/7)*x^2+x+4 = 0
DELTA = 1^2-(4*4*(-22/7))
DELTA = 359/7
DELTA > 0
x = ((359/7)^(1/2)-1)/(2*(-22/7)) or x = (-(359/7)^(1/2)-1)/(2*(-22/7))
x = -7/44*((359/7)^(1/2)-1) or x = 7/44*((359/7)^(1/2)+1)
x in { -7/44*((359/7)^(1/2)-1), 7/44*((359/7)^(1/2)+1)}
x in { -7/44*((359/7)^(1/2)-1), 7/44*((359/7)^(1/2)+1) }
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