12х-х-55=0
11х=55+0
11х=55
х=55:11
х=5
12·5-5-55=0
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12х-х-55=0
11х=55+0
11х=55
х=55:11
х=5
12·5-5-55=0
11 х= 55
Х = 55÷11
Х =5