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D( x )
5*x-2 = 0
7*x+3 = 0
5*x-2 = 0
5*x-2 = 0
5*x-2 = 0 // + 2
5*x = 2 // : 5
x = 2/5
7*x+3 = 0
7*x+3 = 0
7*x+3 = 0 // - 3
7*x = -3 // : 7
x = -3/7
x in (-oo:-3/7) U (-3/7:2/5) U (2/5:+oo)
4/(5*x-2) = 6/(7*x+3) // - 6/(7*x+3)
4/(5*x-2)-(6/(7*x+3)) = 0
4/(5*x-2)-6*(7*x+3)^-1 = 0
4/(5*x-2)-6/(7*x+3) = 0
(4*(7*x+3))/((5*x-2)*(7*x+3))+(-6*(5*x-2))/((5*x-2)*(7*x+3)) = 0
4*(7*x+3)-6*(5*x-2) = 0
24-2*x = 0
(24-2*x)/((5*x-2)*(7*x+3)) = 0
(24-2*x)/((5*x-2)*(7*x+3)) = 0 // * (5*x-2)*(7*x+3)
24-2*x = 0
24-2*x = 0 // - 24
-2*x = -24 // : -2
x = -24/(-2)
x = 12
x = 12
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