Question 846788
Let {{{ x }}} = the total number of coins
{{{ (1/2)*x + (1/6)*x + (1/6)*x + (1/12)*x + 7 = x }}}
Multiply both sides by {{{ 12 }}}
{{{ 6x + 2x + 2x + x + 84 = 12x }}}
{{{ 11x + 84 = 12x }}}
{{{ x = 84 }}}
There are 84 coins 
{{{ (1/2)*84 = 42 }}} from England
{{{ (1/6)*84 = 14 }}} from Switzerland
{{{ (1/6)*84 = 14 }}} from France
{{{ (1/12)*84 = 7 }}} from Italy
{{{ 7 }}} from Spain
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{{{ 42 + 14 + 14 + 7 + 7 = 84 }}}
OK