Respuesta :

8.7 = 3.5m - 2.5(5.4 - 6m

3.5m - 2.5(5.4 - 6m) = 8.7

18.5m - 13.5 = 8.7

18.5m - 13.5 + 13.5 = 8.7 + 13.5
 
18.5m = 22.2

18.5m = 22.2
---------   --------
  18.5     18.5

m = 1.2
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