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6a + 3b = 21
7a - 4b = 2
eliminasikan
a = 2
b = 3
1/x = a
1/x = 2
x = 1/2
1/y = b
1/y = 3
y= 1/3
6xy = 6 . 1/2 . 1/3
= 6/6
= 1
jawaban C