Question 1090266
{{{ (x/3) = (12/x) }}}
{{{ x^2 = 36 }}}
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Ans:  {{{ x=-6 }}}, {{{ x=6}}}  are solutions
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Check:   {{{ (-6/3) + (3/-6) = (12/-6) + (3/-6) = 15/-6 }}}  (ok)
               {{{ (6/3) + (3/6) = (12/6) + (3/6) = 15/6  }}}  (ok)