Răspuns :
2×(X+1)-6=4
2×(X+1)=4+6
2×(X+1)=10
X+1=10:2
X+1=5
X=5-1
X=4
Verificare: 2×(4+1)-6=
2×5-6=
10-6=4
2×(X+1)=4+6
2×(X+1)=10
X+1=10:2
X+1=5
X=5-1
X=4
Verificare: 2×(4+1)-6=
2×5-6=
10-6=4