Respuesta :

2,500+2000a=47,900-800a
-2,500             -2,500

2000a=45,400-800a
+800a            +800a

2800a=45,400
/2800   /2800

a = 16.21
faizu
2,500+2000a=47,900-800a=> 2000a + 800a = 47900 - 2500
=> 2800 a = 45400
=> a = 45400 / 2800
=> a = 227/14 

Hope it helps!!!