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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)
1.95 = x/(2-x) // - x/(2-x)
1.95-(x/(2-x)) = 0
(-1*x)/(2-x)+1.95 = 0
(-1*x)/(2-x)+(1.95*(2-x))/(2-x) = 0
1.95*(2-x)-1*x = 0
3.9-2.95*x = 0
(3.9-2.95*x)/(2-x) = 0
(3.9-2.95*x)/(2-x) = 0 // * 2-x
3.9-2.95*x = 0
3.9-2.95*x = 0 // - 3.9
-2.95*x = -3.9 // : -2.95
x = -3.9/(-2.95)
x = 1.3220339
x = 1.3220339
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