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D( x )
2*x+6 = 0
4*x+8 = 0
2*x+6 = 0
2*x+6 = 0
2*x+6 = 0 // - 6
2*x = -6 // : 2
x = -6/2
x = -3
4*x+8 = 0
4*x+8 = 0
4*x+8 = 0 // - 8
4*x = -8 // : 4
x = -8/4
x = -2
x in (-oo:-3) U (-3:-2) U (-2:+oo)
5/(2*x+6) = 9/(4*x+8) // - 9/(4*x+8)
5/(2*x+6)-(9/(4*x+8)) = 0
5/(2*x+6)-9*(4*x+8)^-1 = 0
5/(2*x+6)-9/(4*x+8) = 0
(5*(4*x+8))/((2*x+6)*(4*x+8))+(-9*(2*x+6))/((2*x+6)*(4*x+8)) = 0
5*(4*x+8)-9*(2*x+6) = 0
2*x-14 = 0
(2*x-14)/((2*x+6)*(4*x+8)) = 0
(2*x-14)/((2*x+6)*(4*x+8)) = 0 // * (2*x+6)*(4*x+8)
2*x-14 = 0
2*x-14 = 0 // + 14
2*x = 14 // : 2
x = 14/2
x = 7
x = 7
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