Răspuns :
In prezent: Am 5 ani
In viitor: am 5 ani+x
In prezent: mama are 26
In viitor: mama are 26+x
4(5+x)=26+x
20+4x=26+x
4x-x=26-20
3x=6
x=6:3
x=2
Peste 2 ani
In viitor: am 5 ani+x
In prezent: mama are 26
In viitor: mama are 26+x
4(5+x)=26+x
20+4x=26+x
4x-x=26-20
3x=6
x=6:3
x=2
Peste 2 ani