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D( x )
x+0.63 = 0
x+0.63 = 0
x+0.63 = 0
x+0.63 = 0 // - 0.63
x = -0.63
x in (-oo:-0.63) U (-0.63:+oo)
(22*x+16)/(x+0.63) = 23.4 // - 23.4
(22*x+16)/(x+0.63)-23.4 = 0
(22*x+16)/(x+0.63)+(-23.4*(x+0.63))/(x+0.63) = 0
22*x-23.4*(x+0.63)+16 = 0
1.258-1.4*x = 0
(1.258-1.4*x)/(x+0.63) = 0
(1.258-1.4*x)/(x+0.63) = 0 // * x+0.63
1.258-1.4*x = 0
1.258-1.4*x = 0 // - 1.258
-1.4*x = -1.258 // : -1.4
x = -1.258/(-1.4)
x = 0.89857143
x = 0.89857143
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