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D( x )
x-7 = 0
x-14 = 0
x-7 = 0
x-7 = 0
x-7 = 0 // + 7
x = 7
x-14 = 0
x-14 = 0
x-14 = 0 // + 14
x = 14
x in (-oo:7) U (7:14) U (14:+oo)
-5/(x-7) = -6/(x-14)-((-35/(x-7))*(x-14)) // + -6/(x-14)-((-35/(x-7))*(x-14))
(-35/(x-7))*(x-14)-5/(x-7)-(-6/(x-14)) = 0
6*(x-14)^-1-5/(x-7)+(-35/(x-7))*(x-14) = 0
6/(x-14)-5/(x-7)+(-35*(x-14))/(x-7) = 0
(-5*(x-14))/((x-7)*(x-14))+(6*(x-7))/((x-7)*(x-14))+(-35*(x-14)^2)/((x-7)*(x-14)) = 0
6*(x-7)-5*(x-14)-35*(x-14)^2 = 0
x-35*x^2+980*x-6860+28 = 0
981*x-35*x^2-6832 = 0
981*x-35*x^2-6832 = 0
981*x-35*x^2-6832 = 0
DELTA = 981^2-(-6832*(-35)*4)
DELTA = 5881
DELTA > 0
x = (5881^(1/2)-981)/(-35*2) or x = (-5881^(1/2)-981)/(-35*2)
x = (5881^(1/2)-981)/(-70) or x = (5881^(1/2)+981)/70
(x-((5881^(1/2)-981)/(-70)))*(x-((5881^(1/2)+981)/70)) = 0
((x-((5881^(1/2)-981)/(-70)))*(x-((5881^(1/2)+981)/70)))/((x-7)*(x-14)) = 0
((x-((5881^(1/2)-981)/(-70)))*(x-((5881^(1/2)+981)/70)))/((x-7)*(x-14)) = 0 // * (x-7)*(x-14)
(x-((5881^(1/2)-981)/(-70)))*(x-((5881^(1/2)+981)/70)) = 0
( x-((5881^(1/2)+981)/70) )
x-((5881^(1/2)+981)/70) = 0 // + (5881^(1/2)+981)/70
x = (5881^(1/2)+981)/70
( x-((5881^(1/2)-981)/(-70)) )
x-((5881^(1/2)-981)/(-70)) = 0 // + (5881^(1/2)-981)/(-70)
x = (5881^(1/2)-981)/(-70)
x in { (5881^(1/2)+981)/70, (5881^(1/2)-981)/(-70) }
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