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3x = 7 + 2
3x = 9
x = 3
4^(x + 2y) = 8
2^(2x + 4y) = 2³
2x + 4y = 3
2. 3 + 4y = 3
6 + 4y = 3
4y = 3 - 6
4y = - 3
y = - 3/4
x + y = 3 - 3/4
= 9/4 jawaban : C