Respuestas

2013-03-28T20:16:49+01:00

x +3x-x = 18

3x = 18

X = 18/3

X  = 6

 

3x=25-5+40  

3x = 60

X = 60/3

X= 20

 

4x = 29-25

4x = 4

X = 4/4

X=1