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D( x )
x+5 = 0
x-7 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x-7 = 0
x-7 = 0
x-7 = 0 // + 7
x = 7
x in (-oo:-5) U (-5:7) U (7:+oo)
(3*x)/(x+5)+(2*x)/(x-7) = 0
(3*x*(x-7))/((x+5)*(x-7))+(2*x*(x+5))/((x+5)*(x-7)) = 0
3*x*(x-7)+2*x*(x+5) = 0
5*x^2-11*x = 0
5*x^2-11*x = 0
x*(5*x-11) = 0
5*x-11 = 0 // + 11
5*x = 11 // : 5
x = 11/5
x*(x-11/5) = 0
(x*(x-11/5))/((x+5)*(x-7)) = 0
(x*(x-11/5))/((x+5)*(x-7)) = 0 // * (x+5)*(x-7)
x*(x-11/5) = 0
( x-11/5 )
x-11/5 = 0 // + 11/5
x = 11/5
( x )
x = 0
x in { 11/5, 0 }
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