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D( K )
K = 0
K = 0
K = 0
K in (-oo:0) U (0:+oo)
90/54 = 72/K // - 72/K
90/54-(72/K) = 0
90/54-72*K^-1 = 0
-72*K^-1 = -5/3 // : -72
K^-1 = 5/216
-1 < 0
1/(K^1) = 5/216 // * K^1
1 = 5/216*K^1 // : 5/216
216/5 = K^1
K = 216/5
K = 216/5
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