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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
72/4.8 = 20.4/c // - 20.4/c
72/4.8-(20.4/c) = 0
72/4.8-20.4*c^-1 = 0
-20.4*c^-1 = -15 // : -20.4
c^-1 = 0.73529412
-1 < 0
1/(c^1) = 0.73529412 // * c^1
1 = 0.73529412*c^1 // : 0.73529412
1.36 = c^1
c = 1.36
c = 1.36
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