Răspuns:
[tex](23 - 42 \div 7 + y \times 7) \div 9 = 5[/tex]
[tex](23 - 6 + 7y) \div 9 = 5[/tex]
[tex](17 + 7y) \div 9 = 5[/tex]
[tex]17 + 7y = 5 \times 9[/tex]
[tex]17 + 7y = 45[/tex]
[tex]7y = 45 - 17[/tex]
[tex]7y = 28[/tex]
[tex]y = \frac{28}{7} [/tex]
[tex]y = 4[/tex]
