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D( x )
1.85-x = 0
1.85-x = 0
1.85-x = 0
1.85-x = 0 // - 1.85
-x = -1.85 // * -1
x = 1.85
x in (-oo:1.85) U (1.85:+oo)
5.06 = (x+0.5)/(1.85-x) // - (x+0.5)/(1.85-x)
5.06-((x+0.5)/(1.85-x)) = 0
(-1*(x+0.5))/(1.85-x)+5.06 = 0
(-1*(x+0.5))/(1.85-x)+(5.06*(1.85-x))/(1.85-x) = 0
5.06*(1.85-x)-1*(x+0.5) = 0
8.861-6.06*x = 0
(8.861-6.06*x)/(1.85-x) = 0
(8.861-6.06*x)/(1.85-x) = 0 // * 1.85-x
8.861-6.06*x = 0
8.861-6.06*x = 0 // - 8.861
-6.06*x = -8.861 // : -6.06
x = -8.861/(-6.06)
x = 1.46221122
x = 1.46221122
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