If 5^-P = 4^-9 = 20^r; show that: 1/p+1/q+1/r =0
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If:* *A = 1 ; B = 2 ; C = 3 ; D = 4 ;* *E = 5 ; F = 6 ; G = 7 ; H = 8 ;* *I = 9 ; J = 10 ; K = 11 ; L = 12 ;* *M = 13 ; N = 14 ; O = 15 ; P = 16 ;* *Q = 17 ; R = 18 ; S = 19 ; T = 20 ;*
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