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KxOy
39x + 16y = 110
39x/110 * 100% = 71%
39x = 110 - 16y
3900x/110 = 71
3900x = 71*110
3900x = 7810/2
x = 2
39 * 2 + 16y = 110
16y = 110 - 78
16y = 32
y = 2
K2O2 nadtlenek potasu
:)