Доберіть коефіцієнти:
Al + WO 3 → W + Al 2 O 3

SiO 2 + HF → SiF 4 + H 2 O

Al 2 O 3 + HCl → AlCl 3 + H 2 O

K + H 2 O → KOH + H 2

Fe 2 O 3 + HCl → FeCl 3 + H 2 O
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