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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
((7/2)/35)/X = 4/5 // - 4/5
((7/2)/35)/X-(4/5) = 0
((7/2)/35)/X-4/5 = 0
1/10*X^-1 = 4/5 // : 1/10
X^-1 = 8
-1 < 0
1/(X^1) = 8 // * X^1
1 = 8*X^1 // : 8
1/8 = X^1
X = 1/8
X = 1/8
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