The number is c and decrease by three eights. So expression is,
[tex]c-\frac{3}{8}[/tex]The obtained expression is equal to two ninths of the number c, which is 2/9c. So equation is,
[tex]\begin{gathered} c-\frac{3}{8}=\frac{2}{9}c \\ c-\frac{2}{9}c=\frac{3}{8} \\ \frac{7}{9}c=\frac{3}{8} \end{gathered}[/tex]So equation is c - 3/8 = 2/9 or 7/9c = 3/8.
