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D( x )
1.2-x = 0
1.2-x = 0
1.2-x = 0
1.2-x = 0 // - 1.2
-x = -1.2 // * -1
x = 1.2
x in (-oo:1.2) U (1.2:+oo)
(15*x)/(1.2-x) = 4 // - 4
(15*x)/(1.2-x)-4 = 0
(15*x)/(1.2-x)+(-4*(1.2-x))/(1.2-x) = 0
15*x-4*(1.2-x) = 0
19*x-4.8 = 0
(19*x-4.8)/(1.2-x) = 0
(19*x-4.8)/(1.2-x) = 0 // * 1.2-x
19*x-4.8 = 0
19*x-4.8 = 0 // + 4.8
19*x = 4.8 // : 19
x = 4.8/19
x = 0.25263158
x = 0.25263158
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