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D( x )
x = 0
x-4 = 0
x = 0
x = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:0) U (0:4) U (4:+oo)
6/x = (22/(x-4))*(x+1)-2/x+4 // - (22/(x-4))*(x+1)-2/x+4
6/x-((22/(x-4))*(x+1))-(-2/x)-4 = 0
6/x-22*(x+1)*(x-4)^-1+2*x^-1-4 = 0
(-22*(x+1))/(x-4)+6/x+2/x-4 = 0
(-22*x*(x+1))/(x*(x-4))+(6*(x-4))/(x*(x-4))+(2*(x-4))/(x*(x-4))+(-4*x*(x-4))/(x*(x-4)) = 0
6*(x-4)-22*x*(x+1)+2*(x-4)-4*x*(x-4) = 0
2*x-22*x^2-4*x^2-16*x+16*x-24-8 = 0
16*x-22*x^2-4*x^2-14*x-32 = 0
2*x-26*x^2-32 = 0
2*x-26*x^2-32 = 0
2*(x-13*x^2-16) = 0
x-13*x^2-16 = 0
DELTA = 1^2-(-16*(-13)*4)
DELTA = -831
DELTA < 0
2 = 0
2/(x*(x-4)) = 0
2/(x*(x-4)) = 0 // * x*(x-4)
2 = 0
x belongs to the empty set
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