55х + 710 = 820
55х = 820 - 710
55х = 110
х = 110 : 55
х = 2
проверка: 55 * 2 + 710 = 110 + 710 = 820
820 = 820
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Verified answer
55х + 710 = 820
55х = 820 - 710
55х = 110
х = 110 : 55
х = 2
проверка: 55 * 2 + 710 = 110 + 710 = 820
820 = 820