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D( x )
x-3 = 0
2*x+6 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
2*x+6 = 0
2*x+6 = 0
2*x+6 = 0 // - 6
2*x = -6 // : 2
x = -6/2
x = -3
x in (-oo:-3) U (-3:3) U (3:+oo)
24/(2*x+6)+1/(x-3) = 13/2 // - 13/2
24/(2*x+6)+1/(x-3)-(13/2) = 0
24/(2*x+6)+1/(x-3)-13/2 = 0
(2*24*(x-3))/(2*(2*x+6)*(x-3))+(1*2*(2*x+6))/(2*(2*x+6)*(x-3))+(-13*(2*x+6)*(x-3))/(2*(2*x+6)*(x-3)) = 0
2*24*(x-3)+1*2*(2*x+6)-13*(2*x+6)*(x-3) = 0
52*x-26*x^2-132+234 = 0
52*x-26*x^2+102 = 0
52*x-26*x^2+102 = 0
2*(26*x-13*x^2+51) = 0
26*x-13*x^2+51 = 0
DELTA = 26^2-(-13*4*51)
DELTA = 3328
DELTA > 0
x = (3328^(1/2)-26)/(-13*2) or x = (-3328^(1/2)-26)/(-13*2)
x = (16*13^(1/2)-26)/(-26) or x = (-16*13^(1/2)-26)/(-26)
2*(x-((16*13^(1/2)-26)/(-26)))*(x-((-16*13^(1/2)-26)/(-26))) = 0
(2*(x-((16*13^(1/2)-26)/(-26)))*(x-((-16*13^(1/2)-26)/(-26))))/(2*(2*x+6)*(x-3)) = 0
(2*(x-((16*13^(1/2)-26)/(-26)))*(x-((-16*13^(1/2)-26)/(-26))))/(2*(2*x+6)*(x-3)) = 0 // * 2*(2*x+6)*(x-3)
2*(x-((16*13^(1/2)-26)/(-26)))*(x-((-16*13^(1/2)-26)/(-26))) = 0
( x-((-16*13^(1/2)-26)/(-26)) )
x-((-16*13^(1/2)-26)/(-26)) = 0 // + (-16*13^(1/2)-26)/(-26)
x = (-16*13^(1/2)-26)/(-26)
( x-((16*13^(1/2)-26)/(-26)) )
x-((16*13^(1/2)-26)/(-26)) = 0 // + (16*13^(1/2)-26)/(-26)
x = (16*13^(1/2)-26)/(-26)
x in { (-16*13^(1/2)-26)/(-26), (16*13^(1/2)-26)/(-26) }
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