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tina = y
x + y = 99.000
x - y = 9.000
pilih salah satu
x - y = 9.000
x = 9.000 + y
ambil yang satunya lagi, trs ubah variabel x nya seperti yg diatas
x + y = 99.000
9.000 + y + y = 99.000
2y = 99.000 - 9.000 = 90.000
y = 45.000
x = 9.000 + y
x = 9.000 + 45.000
x = 54.000
perbandingan = 54.000 : 45.000 = 6 : 5
semoga membantu :D