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D( x )
1-x = 0
1-x = 0
1-x = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x in (-oo:1) U (1:+oo)
(5*x)/(1-x)+12 = 19 // - 19
(5*x)/(1-x)-19+12 = 0
(5*x)/(1-x)+(-19*(1-x))/(1-x)+(12*(1-x))/(1-x) = 0
12*(1-x)-19*(1-x)+5*x = 0
24*x-12*x-19+12 = 0
12*x-7 = 0
(12*x-7)/(1-x) = 0
(12*x-7)/(1-x) = 0 // * 1-x
12*x-7 = 0
12*x-7 = 0 // + 7
12*x = 7 // : 12
x = 7/12
x = 7/12
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