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2C₂H₂ + 5O₂ ---> 4CO₂ + 2 H₂O
Mg + 2HCl ---> MgCl₂ + H₂
Al₂O₃ + 6HCl ---> 2AlCl₃ + 3H₂O
nomor 4 itu kayaknya nggak bisa disetarakan. tiap akan disetarakan, unsur Oksigennya selalu kelebihan