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D( x )
5*x+3 = 0
4*x+2 = 0
5*x+3 = 0
5*x+3 = 0
5*x+3 = 0 // - 3
5*x = -3 // : 5
x = -3/5
4*x+2 = 0
4*x+2 = 0
4*x+2 = 0 // - 2
4*x = -2 // : 4
x = -2/4
x = -1/2
x in (-oo:-3/5) U (-3/5:-1/2) U (-1/2:+oo)
7/(4*x+2) = 6/(5*x+3) // - 6/(5*x+3)
7/(4*x+2)-(6/(5*x+3)) = 0
7/(4*x+2)-6*(5*x+3)^-1 = 0
7/(4*x+2)-6/(5*x+3) = 0
(7*(5*x+3))/((4*x+2)*(5*x+3))+(-6*(4*x+2))/((4*x+2)*(5*x+3)) = 0
7*(5*x+3)-6*(4*x+2) = 0
11*x+9 = 0
(11*x+9)/((4*x+2)*(5*x+3)) = 0
(11*x+9)/((4*x+2)*(5*x+3)) = 0 // * (4*x+2)*(5*x+3)
11*x+9 = 0
11*x+9 = 0 // - 9
11*x = -9 // : 11
x = -9/11
x = -9/11
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