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7x+6y=-2 *2
(dieliminasi)
14x-35y=98
14x+12y=-4
(dikurang)
-47y=102
y=-102/47
x= 7x+6(-102/47)=-2
x nanti ketemu
lalu dimasukin ke 3x-4y]
sepertinya hasilnya kurang bagus