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D( x )
x-14 = 0
x-14 = 0
x-14 = 0
x-14 = 0 // + 14
x = 14
x in (-oo:14) U (14:+oo)
x/(x-14)-0.3 = 0
x/(x-14)+(-0.3*(x-14))/(x-14) = 0
x-0.3*(x-14) = 0
0.7*x+4.2 = 0
(0.7*x+4.2)/(x-14) = 0
(0.7*x+4.2)/(x-14) = 0 // * x-14
0.7*x+4.2 = 0
0.7*x+4.2 = 0 // - 4.2
0.7*x = -4.2 // : 0.7
x = -4.2/0.7
x = -6
x = -6
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