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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
-59/c = -7 // + 7
7-59/c = 0
-59*c^-1 = -7 // : -59
c^-1 = 7/59
-1 < 0
1/(c^1) = 7/59 // * c^1
1 = 7/59*c^1 // : 7/59
59/7 = c^1
c = 59/7
c = 59/7
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