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D( x )
x+5 = 0
13*x-7 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
13*x-7 = 0
13*x-7 = 0
13*x-7 = 0 // + 7
13*x = 7 // : 13
x = 7/13
x in (-oo:-5) U (-5:7/13) U (7/13:+oo)
(6*x)/(13*x-7) = x/(x+5) // - x/(x+5)
(6*x)/(13*x-7)-(x/(x+5)) = 0
(6*x)/(13*x-7)+(-1*x)/(x+5) = 0
(6*x*(x+5))/((13*x-7)*(x+5))+(-1*x*(13*x-7))/((13*x-7)*(x+5)) = 0
6*x*(x+5)-1*x*(13*x-7) = 0
37*x-7*x^2 = 0
37*x-7*x^2 = 0
x*(37-7*x) = 0
37-7*x = 0 // - 37
-7*x = -37 // : -7
x = -37/(-7)
x = 37/7
x*(x-37/7) = 0
(x*(x-37/7))/((13*x-7)*(x+5)) = 0
(x*(x-37/7))/((13*x-7)*(x+5)) = 0 // * (13*x-7)*(x+5)
x*(x-37/7) = 0
( x-37/7 )
x-37/7 = 0 // + 37/7
x = 37/7
( x )
x = 0
x in { 37/7, 0 }
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