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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
12/100 = (1000-X)/X // - (1000-X)/X
12/100-((1000-X)/X) = 0
(-1*(1000-X))/X+3/25 = 0
(-1*25*(1000-X))/(25*X)+(3*X)/(25*X) = 0
3*X-1*25*(1000-X) = 0
28*X-25000 = 0
(28*X-25000)/(25*X) = 0
(28*X-25000)/(25*X) = 0 // * 25*X
28*X-25000 = 0
28*X-25000 = 0 // + 25000
28*X = 25000 // : 28
X = 25000/28
X = 6250/7
X = 6250/7
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