a. `x + 3`$\frac{1}{5}$ `= 4`
`x` + $\frac{16}{5}$ = `4`
`x = 4` - $\frac{16}{5}$
`x ` = $\frac{4}{5}$
`b . ( x -` $\frac{2}{3}$ ) x `3` = $\frac{3}{4}$
`x` - $\frac{2}{3}$ = $\frac{3}{4}$ : `3`
`x` - $\frac{2}{3}$ = $\frac{1}{4}$
`x` = $\frac{1}{4}$ + $\frac{2}{3}$
`x` = $\frac{9}{12}$
`x` = $\frac{3}{4}$
`Luna`