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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
20-(18/c) = 17 // - 17
20-(18/c)-17 = 0
20-18*c^-1-17 = 0
-18*c^-1 = -3 // : -18
c^-1 = 1/6
-1 < 0
1/(c^1) = 1/6 // * c^1
1 = 1/6*c^1 // : 1/6
6 = c^1
c = 6
c = 6
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