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D( x )
-5*x = 0
-5*x = 0
-5*x = 0
-5*x = 0 // : -5
x = 0
x in (-oo:0) U (0:+oo)
(10-x)/(-5*x) = 1.02 // - 1.02
(10-x)/(-5*x)-1.02 = 0
(10-x)/(-5*x)+(-5*(-1.02)*x)/(-5*x) = 0
10-x-5*(-1.02)*x = 0
4.1*x+10 = 0
(4.1*x+10)/(-5*x) = 0
(4.1*x+10)/(-5*x) = 0 // * -5*x
4.1*x+10 = 0
4.1*x+10 = 0 // - 10
4.1*x = -10 // : 4.1
x = -10/4.1
x = -2.43902439
x = -2.43902439
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