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y = 4 - x
2x - 3y = -6
2x - 3(4 - x) = -6
2x - 12 + 3x = -6
5x = 12 - 6
5x = 6
x = 6/5
y = 4 - x
y = 4 - 6/5
y = 14/5
Jadi, R yang memenuhi adalah (6/5 , 14/5)