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D( x )
2*x+4 = 0
2*x+4 = 0
2*x+4 = 0
2*x+4 = 0 // - 4
2*x = -4 // : 2
x = -4/2
x = -2
x in (-oo:-2) U (-2:+oo)
x/(2*x+4)+1/6 = 0
(6*x)/(6*(2*x+4))+(1*(2*x+4))/(6*(2*x+4)) = 0
1*(2*x+4)+6*x = 0
8*x+4 = 0
(8*x+4)/(6*(2*x+4)) = 0
(8*x+4)/(6*(2*x+4)) = 0 // * 6*(2*x+4)
8*x+4 = 0
8*x+4 = 0 // - 4
8*x = -4 // : 8
x = -4/8
x = -1/2
x = -1/2
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