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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
-4.5/X = -1.8/5 // + -1.8/5
-4.5/X-(-1.8/5) = 0
0.36-4.5/X = 0
-4.5*X^-1 = -0.36 // : -4.5
X^-1 = 0.08
-1 < 0
1/(X^1) = 0.08 // * X^1
1 = 0.08*X^1 // : 0.08
12.5 = X^1
X = 12.5
X = 12.5
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