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D( X )
5*X+2 = 0
5*X+2 = 0
5*X+2 = 0
5*X+2 = 0 // - 2
5*X = -2 // : 5
X = -2/5
X in (-oo:-2/5) U (-2/5:+oo)
4/3 = 14/(5*X+2) // - 14/(5*X+2)
4/3-(14/(5*X+2)) = 0
4/3-14*(5*X+2)^-1 = 0
4/3-14/(5*X+2) = 0
(-14*3)/(3*(5*X+2))+(4*(5*X+2))/(3*(5*X+2)) = 0
4*(5*X+2)-14*3 = 0
20*X-34 = 0
(20*X-34)/(3*(5*X+2)) = 0
(20*X-34)/(3*(5*X+2)) = 0 // * 3*(5*X+2)
20*X-34 = 0
20*X-34 = 0 // + 34
20*X = 34 // : 20
X = 34/20
X = 17/10
X = 17/10
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