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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
50/X+50/X-2.5+2.5 = 40 // - 40
50/X+50/X-40-2.5+2.5 = 0
100*X^-1 = 40 // : 100
X^-1 = 2/5
-1 < 0
1/(X^1) = 2/5 // * X^1
1 = 2/5*X^1 // : 2/5
5/2 = X^1
X = 5/2
X = 5/2
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