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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
140 = (20*175)/c // - (20*175)/c
140-((20*175)/c) = 0
140-3500*c^-1 = 0
-3500*c^-1 = -140 // : -3500
c^-1 = 1/25
-1 < 0
1/(c^1) = 1/25 // * c^1
1 = 1/25*c^1 // : 1/25
25 = c^1
c = 25
c = 25
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