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which expression is equivalent for (3/7)^2 • (2/3)^-3^-1
A: (7/3)^2 • (2/3)^3
B: (7/3)^-2 • (2/3)^-3
C: (3/7)^2 • (2/3)^-3
D: (3/7) • (2/3)^-4