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3a - 2b = 8 ---> 6a - 4b = 16
2a + 4b = 8
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8a = 24
a = 3
2 . 3 + 4b = 8
6 + 4b = 8
4b = 2
b = 1/2
Nilai a dan b berturut-turut adalah 2 dan 1/2