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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)
9.4 = x/(1.87-x) // - x/(1.87-x)
9.4-(x/(1.87-x)) = 0
(-1*x)/(1.87-x)+9.4 = 0
(-1*x)/(1.87-x)+(9.4*(1.87-x))/(1.87-x) = 0
9.4*(1.87-x)-1*x = 0
17.578-10.4*x = 0
(17.578-10.4*x)/(1.87-x) = 0
(17.578-10.4*x)/(1.87-x) = 0 // * 1.87-x
17.578-10.4*x = 0
17.578-10.4*x = 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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