Respuestas

2012-09-25T00:26:39+02:00

z+51=89--->z=89-51-->z=38

x-65=53-->x=53+65-->x=118

x+x=26-->2x=26-->x=13

 

2012-09-25T00:39:49+02:00

z + 51 = 89

z = 89 - 51

z= 38

 

x - 65 = 53

x = 53 + 65

x = 118

 

x + x = 26

x2 = 26

x = 26/2

x = 13