Salut,
[tex] \frac{3}{2} x = \frac{3}{4} \ \textless \ =\ \textgreater \ x = \frac{ \frac{3}{4} }{ \frac{3}{2} } \ \textless \ =\ \textgreater \ x=\frac{3}{4} * \frac{2}{3} \ \textless \ =\ \textgreater \ x = \frac{1}{2} \\
4x + 1 = 9 \ \textless \ =\ \textgreater \ 4x = 8 \ \textless \ =\ \textgreater \ x = \frac{8}{4} \ \textless \ =\ \textgreater \ x = 2
[/tex]
Bonne journée !