Răspuns :
2 ( x + 1) = 6
2 x + 2 = 6
2 x = 6 - 2
2 x = 4
x = 4 : 2
x = 2
Verific: 2 × ( 2 + 1 ) = 2 × 3 = 6
2 x + 2 = 6
2 x = 6 - 2
2 x = 4
x = 4 : 2
x = 2
Verific: 2 × ( 2 + 1 ) = 2 × 3 = 6