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Fen completed a triathlon race whose total distance is $$D$$ kilometers. First, she swam a distance of $$0.5$$ kilometer. Then, she rode a bicycle for $$x$$ hours at an average speed of $$20$$ kilometers per hour. Finally, she ran for $$0.5$$ hour at an average speed of $$v$$ kilometers per hour. Write an equation that relates $$D$$, $$x$$, and $$v$$.