Salut.
[tex]\displaystyle{ \frac{x+1}{5}=\frac{3}{5} }[/tex]
[tex]\displaystyle{(x + 1) \times 5 = 3 \times 5 }[/tex]
[tex]\displaystyle{ (x + 1) \times 5 = 15 }[/tex]
[tex]\displaystyle{ x + 1 = 15 : 5 }[/tex]
[tex]\displaystyle{ x + 1 = 3 }[/tex]
[tex]\displaystyle{ x = 3 - 1 }[/tex]
[tex]\boxed{x=2}[/tex]
- Lumberjack25