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D( x )
5*x+6 = 0
5*x+6 = 0
5*x+6 = 0
5*x+6 = 0 // - 6
5*x = -6 // : 5
x = -6/5
x in (-oo:-6/5) U (-6/5:+oo)
(10*x+3)/(5*x+6) = 1/2 // - 1/2
(10*x+3)/(5*x+6)-(1/2) = 0
(10*x+3)/(5*x+6)-1/2 = 0
(2*(10*x+3))/(2*(5*x+6))+(-1*(5*x+6))/(2*(5*x+6)) = 0
2*(10*x+3)-1*(5*x+6) = 0
15*x = 0
(15*x)/(2*(5*x+6)) = 0
(15*x)/(2*(5*x+6)) = 0 // * 2*(5*x+6)
15*x = 0
15*x = 0 // : 15
x = 0
x = 0
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