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2^7 : 2^3 = 2^2n
2^4 = 2^2n
2^4 ÷ 2^2 = n
2^2 = n
n = 4
b. 16 : 2^2 = 2n
2^4 : 2^2 = 2n
2^2 = 2n
2^2 ÷ 2 = n
2 = n
sorry ya, klo salah. gue ngertinya gitu.