а)3а-2b+12a+7b=15a + 5b
б)3(4х-1)+2 = 12 x - 3 +2= 12x - 1
в)8m+(m-2)-(5m+3) = 8m + m -2 -5m -3 = 4m -5
а)3а-2b+12a+7b=15a + 5b
б)3(4х-1)+2 = 12 x - 3 +2= 12x - 1
в)8m+(m-2)-(5m+3) = 8m + m -2 -5m -3 = 4m -5
б) 12x - 3 + 2 = 12x - 1
в) 8m + m - 2 - 5m - 3 = 4m - 5