Răspuns :
2 ( x + 5 ) + 5 = 25
2 x + 10 = 25 - 5
2 x = 20 - 10
x = 10 : 2
x = 5
V: 2 × ( 5 + 5 ) + 5 = 2 × 10 + 5 = 20 + 5 = 25
2 x + 10 = 25 - 5
2 x = 20 - 10
x = 10 : 2
x = 5
V: 2 × ( 5 + 5 ) + 5 = 2 × 10 + 5 = 20 + 5 = 25
[tex]2(x + 5) + 5 = 25 \\ \\ 2(x + 5) = 25 - 5 \\ \\ 2(x + 5) = 20 \\ \\ x + 5 = 20 \div 2 \\ \\ x + 5 = 10 \\ \\ x = 10 - 5 \\ \\ \boxed{x = 5}[/tex]