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let A = first card and let B = second card; then A = 3B and B = A-6; since A = 3B then B = (3B) - 6; solve B = 3 and A = 9
If b = 9 then the value of 10b is 90
a=7 b=9 ab=? ab is the multiplication of a & b there fore the value of ab=7*9=63