Ответ:
660 : (х + 180) = 3
х + 180 = 660 : 3
х + 180 = 220
х = 220 - 180
х = 40
Проверка :
660 : (40 + 180) = 660 : 220 = 3
3 = 3
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Ответ:
660 : (х + 180) = 3
х + 180 = 660 : 3
х + 180 = 220
х = 220 - 180
х = 40
Проверка :
660 : (40 + 180) = 660 : 220 = 3
3 = 3