.transaContentEdit is at the same level with .edit_transa so you can't use .find() because .find() is use just to find childs from an element. You can try something like this:
$(".transaContentEdit").click(function(e) {
alert($(this).closest(".transe_row").parent().find(".edit_transa").attr("class"));
$(this).closest(".transe_row").parent().find(".edit_transa").show();
});