Ответ:
7-3х = 6х-56
-3х-6х = -56-7
-9х = -63
х = -63 : (-9)
х = 7
Ответ: х= 7
проверка
7-3*7 = 6*7-56
7-21 = 42-56
-14 = -14
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Ответ:
7-3х = 6х-56
-3х-6х = -56-7
-9х = -63
х = -63 : (-9)
х = 7
Ответ: х= 7
проверка
7-3*7 = 6*7-56
7-21 = 42-56
-14 = -14