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misal; Ar X = x
mol X = 7 ÷ x = 7/x
mol X2O3 = (2 ÷ 4) × 7/x = 7/2x
mol X2O3 = Massa X2O3 ÷ Mr X2O3
7/2x = 19 ÷ ( 2 (X) + 3 (16))
14x + 336 = 38x
x = 14