Решите уравнения: 1)(39+х)-84=78
2)(x-83)+316=425
3) (600-х)-92=126
Пример:1) (39+х)-84=78
39+х-84=78
х=78-39+84
х=123
2)(x-83)+316=425
3) (600-х)-92=126
Пример:1) (39+х)-84=78
39+х-84=78
х=78-39+84
х=123
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