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D( x )
4*x+2 = 0
4*x+7 = 0
4*x+2 = 0
4*x+2 = 0
4*x+2 = 0 // - 2
4*x = -2 // : 4
x = -2/4
x = -1/2
4*x+7 = 0
4*x+7 = 0
4*x+7 = 0 // - 7
4*x = -7 // : 4
x = -7/4
x in (-oo:-7/4) U (-7/4:-1/2) U (-1/2:+oo)
(3*x+5)/(4*x+2) = (3*x+4)/(4*x+7) // - (3*x+4)/(4*x+7)
(3*x+5)/(4*x+2)-((3*x+4)/(4*x+7)) = 0
(3*x+5)/(4*x+2)+(-1*(3*x+4))/(4*x+7) = 0
((3*x+5)*(4*x+7))/((4*x+2)*(4*x+7))+(-1*(3*x+4)*(4*x+2))/((4*x+2)*(4*x+7)) = 0
(3*x+5)*(4*x+7)-1*(3*x+4)*(4*x+2) = 0
19*x+27 = 0
(19*x+27)/((4*x+2)*(4*x+7)) = 0
(19*x+27)/((4*x+2)*(4*x+7)) = 0 // * (4*x+2)*(4*x+7)
19*x+27 = 0
19*x+27 = 0 // - 27
19*x = -27 // : 19
x = -27/19
x = -27/19
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