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D( x )
1.87-x = 0
1.87-x = 0
1.87-x = 0
1.87-x = 0 // - 1.87
-x = -1.87 // * -1
x = 1.87
x in (-oo:1.87) U (1.87:+oo)
x/(1.87-x) = 9.4 // - 9.4
x/(1.87-x)-9.4 = 0
x/(1.87-x)+(-9.4*(1.87-x))/(1.87-x) = 0
x-9.4*(1.87-x) = 0
10.4*x-17.578 = 0
(10.4*x-17.578)/(1.87-x) = 0
(10.4*x-17.578)/(1.87-x) = 0 // * 1.87-x
10.4*x-17.578 = 0
10.4*x-17.578 = 0 // + 17.578
10.4*x = 17.578 // : 10.4
x = 17.578/10.4
x = 1.69019231
x = 1.69019231
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