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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
3.5/X = 2.4/4.8 // - 2.4/4.8
3.5/X-(2.4/4.8) = 0
3.5/X-0.5 = 0
3.5*X^-1 = 0.5 // : 3.5
X^-1 = 0.14285714
-1 < 0
1/(X^1) = 0.14285714 // * X^1
1 = 0.14285714*X^1 // : 0.14285714
7.00000014 = X^1
X = 7.00000014
X = 7.00000014
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