Odpowiedź :
c) 4m - (2m + 1) = -5m - 15
4m - 2m - 1 = -5m -15
2m - 1 = 5m - 15
2m - 1 - 5m = -15
-3m = -15 + 1
-3m = -14
m = 4, (6)
c) 4m - (2m + 1) = -5m - 15
4m - 2m - 1 = -5m -15
2m - 1 = 5m - 15
2m - 1 - 5m = -15
-3m = -15 + 1
-3m = -14
m = 4, (6)