$$( \frac { 5 } { a } + \frac { 1 } { 5 } ) + \frac { 2 } { 5 } = \frac { 5 } { a } + ( \frac { 1 } { 5 } + \frac { 2 } { 5 } )$$
$a\neq 0$
$$5\times 5+5a\times \frac{1}{5}+5a\times \frac{2}{5}=5\times 5+5a\times \frac{1}{5}+5a\times \frac{2}{5}$$
$$a\in \mathrm{R}$$
$$a\in \mathrm{R}\setminus 0$$
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