Răspuns :
2a+2a+1=13
4a+1=13
4a=13-1
4a=12
a=12:4a
a=3
primul numar= 3x2=6
al doilea=6+1=7
4a+1=13
4a=13-1
4a=12
a=12:4a
a=3
primul numar= 3x2=6
al doilea=6+1=7