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D( x )
x+9 = 0
x+9 = 0
x+9 = 0
x+9 = 0 // - 9
x = -9
x in (-oo:-9) U (-9:+oo)
(6/(x+9))*(x-7)+(6/(x+9))*(x-5)+x+x = 0
(6*(x-7))/(x+9)+(6*(x-5))/(x+9)+x+x = 0
(6*(x-7))/(x+9)+(6*(x-5))/(x+9)+(x*(x+9))/(x+9)+(x*(x+9))/(x+9) = 0
6*(x-7)+6*(x-5)+x*(x+9)+x*(x+9) = 0
x^2+x^2+12*x+9*x+9*x-72 = 0
x^2+x^2+21*x+9*x-72 = 0
2*x^2+30*x-72 = 0
2*x^2+30*x-72 = 0
2*(x^2+15*x-36) = 0
x^2+15*x-36 = 0
DELTA = 15^2-(-36*1*4)
DELTA = 369
DELTA > 0
x = (369^(1/2)-15)/(1*2) or x = (-369^(1/2)-15)/(1*2)
x = (3*41^(1/2)-15)/2 or x = (-3*41^(1/2)-15)/2
2*(x-((-3*41^(1/2)-15)/2))*(x-((3*41^(1/2)-15)/2)) = 0
(2*(x-((-3*41^(1/2)-15)/2))*(x-((3*41^(1/2)-15)/2)))/(x+9) = 0
(2*(x-((-3*41^(1/2)-15)/2))*(x-((3*41^(1/2)-15)/2)))/(x+9) = 0 // * x+9
2*(x-((-3*41^(1/2)-15)/2))*(x-((3*41^(1/2)-15)/2)) = 0
( x-((-3*41^(1/2)-15)/2) )
x-((-3*41^(1/2)-15)/2) = 0 // + (-3*41^(1/2)-15)/2
x = (-3*41^(1/2)-15)/2
( x-((3*41^(1/2)-15)/2) )
x-((3*41^(1/2)-15)/2) = 0 // + (3*41^(1/2)-15)/2
x = (3*41^(1/2)-15)/2
x in { (-3*41^(1/2)-15)/2, (3*41^(1/2)-15)/2 }
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