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D( x )
5*x-7 = 0
x-1 = 0
5*x-7 = 0
5*x-7 = 0
5*x-7 = 0 // + 7
5*x = 7 // : 5
x = 7/5
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:7/5) U (7/5:+oo)
4/(5*x-7) = 6/(x-1) // - 6/(x-1)
4/(5*x-7)-(6/(x-1)) = 0
4/(5*x-7)-6*(x-1)^-1 = 0
4/(5*x-7)-6/(x-1) = 0
(4*(x-1))/((5*x-7)*(x-1))+(-6*(5*x-7))/((5*x-7)*(x-1)) = 0
4*(x-1)-6*(5*x-7) = 0
(4-30)*x-4+42 = 0
((4-30)*x-4+42)/((5*x-7)*(x-1)) = 0
((4-30)*x-4+42)/((5*x-7)*(x-1)) = 0 // * (5*x-7)*(x-1)
(4-30)*x-4+42 = 0
(4-30)*x-4+42 = 0 // - 42-4
(4-30)*x = -(42-4) // : 4-30
x = (-(42-4))/(4-30)
x = (4-42)/(4-30)
x = (4-42)/(4-30)
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