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72 / (12-х /4)=9
12-х/4=72/9
12-х/4=8
-х/4=8-12
-х/4=-4
х=-4*-4
х=16
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Verified answer
файл
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Verified answer
72 / (12-х /4)=9
12-х/4=72/9
12-х/4=8
-х/4=8-12
-х/4=-4
х=-4*-4
х=16