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x - 5y = -37 dikali 3 menjadi 3x - 15y =-111
3x + 2y = 8 dikurang 3x - 15y = -111
menjadi 17y = 119
y = 7
=> 3x + 2(7) = 8
=> 3x = -6 => x = -2
jadi 6x + 4y = 6(-2) + 4(7) = -12 + 28 =16