Conceding that it won't be easy, Democrats who control the Nevada Assembly and Senate vowed Tuesday to push through meaningful, long-term tax reform this session."There isn't going to be a simple solution to all of this," said Senate Majority Leader Mo Denis, who joined with Assembly Speaker Marilyn Kirkpatrick to say that everything is on the table, including the state's consolidated tax on items such as liquor, cigarettes and some government services, the teachers' margin tax initiative and an expansion of sales taxes to services.But Denis, D-Las Vegas, and Kirkpatrick, D-North Las Vegas, were vague on the details of what …