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maka 3x + 4y = - 12
3x + 4(6x - 14) = -12
3x + 24x - 56 = -12
27x = -12 + 56
27x = 44
x = 44/27
sehingga y = 6x - 14
y = 6(44/27) - 14
y = 264/27 - 14
y = (264 - 378)/27
y = 114/27