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D( x )
10-x = 0
10-x = 0
10-x = 0
10-x = 0 // - 10
-x = -10 // * -1
x = 10
x in (-oo:10) U (10:+oo)
x/(10-x) = 0.19 // - 0.19
x/(10-x)-0.19 = 0
x/(10-x)+(-0.19*(10-x))/(10-x) = 0
x-0.19*(10-x) = 0
1.19*x-1.9 = 0
(1.19*x-1.9)/(10-x) = 0
(1.19*x-1.9)/(10-x) = 0 // * 10-x
1.19*x-1.9 = 0
1.19*x-1.9 = 0 // + 1.9
1.19*x = 1.9 // : 1.19
x = 1.9/1.19
x = 1.59663866
x = 1.59663866
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