3а - 6b = 12
3a = 12 + 6b
а = (12+6b) : 3
а = 4 + 2b
Ответ: а = 2b + 4.
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3а - 6b = 12
3a = 12 + 6b
а = (12+6b) : 3
а = 4 + 2b
Ответ: а = 2b + 4.