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D( x )
4-(x/100) = 0
4-(x/100) = 0
4-(x/100) = 0
4-1/100*x = 0 // - 4
-1/100*x = -4 // : -1/100
x = -4/(-1/100)
x = 400
x in (-oo:400) U (400:+oo)
(X/100)/(4-(x/100)) = 12 // - 12
(X/100)/(4-(x/100))-12 = 0
(1/100*X)/(4-1/100*x)-12 = 0
(1/100*X)/(4-1/100*x)+(-12*(4-1/100*x))/(4-1/100*x) = 0
X/100-12*(4-1/100*x) = 0
1/100*X+3/25*x-48 = 0
(1/100*X+3/25*x-48)/(4-1/100*x) = 0
(1/100*X+3/25*x-48)/(4-1/100*x) = 0 // * 4-1/100*x
1/100*X+3/25*x-48 = 0
1/100*X+3/25*x-48 = 0 // - 1/100*X-48
3/25*x = -(1/100*X-48) // : 3/25
x = (-(1/100*X-48))/3/25
x = 25/3*(48-(1/100*X))
x = 25/3*(48-(1/100*X))
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