Ответ:
12-х=1
-x = 1 -12 = -10
x = 10
5 8/9 + х = 6 1/8
x = 6 1/8 - 5 8/9 =
8-х=4 1/7
-x = 4 1/7 - 8 = -3 6/7
x = 3
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Ответ:
12-х=1
-x = 1
-12 = -10 
x = 10
5 8/9 + х = 6 1/8
x = 6 1/8 - 5 8/9 =
8-х=4 1/7
-x = 4 1/7 - 8 = -3 6/7
x = 3