12А-77=19
12а= 19+77
12a= 96
a=96:12
a= 8
168:А+9 = 168 :8+9 = 30
1) 168:8=21
2) 21+9=30
Ответ: а) 30
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12А-77=19
12а= 19+77
12a= 96
a=96:12
a= 8
168:А+9 = 168 :8+9 = 30
1) 168:8=21
2) 21+9=30
Ответ: а) 30