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Ответ:

[tex](5.4 + x) \div 2 = 4.56 \\ (5.4 + x) = 4.56 \times 2 \\ (5.4 + x) = 9.12 \\ 5.4 + x = 9.12 \\ x = 9.12 - 5.4 \\ x = 3.72[/tex]