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D( x )
2-x = 0
2-x = 0
2-x = 0
2-x = 0 // - 2
-x = -2 // * -1
x = 2
x in (-oo:2) U (2:+oo)
1.25 = x/(2-x) // - x/(2-x)
1.25-(x/(2-x)) = 0
(-1*x)/(2-x)+1.25 = 0
(-1*x)/(2-x)+(1.25*(2-x))/(2-x) = 0
1.25*(2-x)-1*x = 0
2.5-2.25*x = 0
(2.5-2.25*x)/(2-x) = 0
(2.5-2.25*x)/(2-x) = 0 // * 2-x
2.5-2.25*x = 0
2.5-2.25*x = 0 // - 2.5
-2.25*x = -2.5 // : -2.25
x = -2.5/(-2.25)
x = 1.11111111
x = 1.11111111
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