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![\bf x = 0.\overline{5}~\hfill \begin{array}{llll} 10\cdot x&=&5.\overline{5}\\\\ 100\cdot x&=&55.\overline{5} \end{array}~\hfill \begin{array}{rllll} \stackrel{100x}{55.\overline{5}}\\\\ -\stackrel{10x}{5.\overline{5}}\\\cline{1-1} 50 \end{array} \\\\[-0.35em] ~\dotfill\\\\ 100x-10x=50\implies 90x=50\implies x=\cfrac{50}{90}\implies x=\cfrac{5}{9}\implies \stackrel{x = -0.\overline{5}}{x=-\cfrac{5}{9}}](/tpl/images/0238/3628/b38ed.png)
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