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2x - 11y = 23. x-9. -18y + 99y = -217
jumlahnya -73y = 229
y = -3.13
2x - 11y = 23
2x - 11*-3.13 = 23
2x + 34.5 = 23
2x = 23 - 34.5
2x = -11.5
x= -5.75
jadi, {-5.75, -3.13}