Question 1126733
{{{ x/a + x/b = c/d }}}
{{{ (bx/ab) + (ax/ab) = c/d }}}
{{{ (bx+ax)/(ab)  = c/d }}}
{{{  x(a+b)/(ab) = c/d }}}<br>
{{{  highlight(x = abc/(d(a+b))) }}}  with restrictions {{{ a+b <> 0 }}} and {{{ d <> 0}}}