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D( x )
1.4*x-1.4 = 0
1.4*x-1.4 = 0
1.4*x-1.4 = 0
1.4*x-1.4 = 0 // + 1.4
1.4*x = 1.4 // : 1.4
x = 1.4/1.4
x = 1
x in (-oo:1) U (1:+oo)
3.3 = 1/(1.4*x-1.4) // - 1/(1.4*x-1.4)
3.3-(1/(1.4*x-1.4)) = 0
3.3-(1.4*x-1.4)^-1 = 0
3.3-1/(1.4*x-1.4) = 0
(3.3*(1.4*x-1.4))/(1.4*x-1.4)-1/(1.4*x-1.4) = 0
3.3*(1.4*x-1.4)-1 = 0
4.62*x-5.62 = 0
(4.62*x-5.62)/(1.4*x-1.4) = 0
(4.62*x-5.62)/(1.4*x-1.4) = 0 // * 1.4*x-1.4
4.62*x-5.62 = 0
4.62*x-5.62 = 0 // + 5.62
4.62*x = 5.62 // : 4.62
x = 5.62/4.62
x = 1.21645022
x = 1.21645022
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