if 30%of (A-B)=(B+A),then the ratio of A:B is equal to-
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30% of (A-B) = (B+A)
(A-B)*30/100 = (B+A)
(A-B)*3/10 = (B+A)
3A-3B = 10B+10A
3A-10A = 10B+3B
-7A = 13B
-7A/B = 13
A/B = -13/7
Therefore, A:B = -13:7
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