6а-(3а-9b) = 6а - 3а + 9b = 3a + 9b = 3(a+3b) = 2 × (-0,6) = - 1,2
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6а-(3а-9b) = 6а - 3а + 9b = 3a + 9b = 3(a+3b) = 2 × (-0,6) = - 1,2