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3x + 4 = 2y
6x - 2y = 2
6x - ( 3x + 4 ) = 2
6x - 3x - 4 = 2
3x = 2 + 4
3x = 6
x = 6/3
x = 2
2y = 3x + 4
2y = 6 + 4
2y = 10
y = 10/2
y = 5
jawaban nya : x = 2 dan y = 5