Respuestas

2013-01-24T01:25:29+01:00

 4x-6=20

4x=20+6

4x=26

x=26/4

x=13/2

 

verif: (4*13/2)-6 =20

           (52/2)-6 = 20

             26-6=20

 

2x+8=13

2x=13-8

2x=5

x=5/2

 

verif: (2*5/2)+8=13

          (10/2)+8=13

             5+8=13

 

espero te sirva (=