The Nevada Supreme Court thrust the discussion about taxes onto state lawmakers Thursday, upholding a business tax proposal backed by the teachers union and other labor groups and sending it to the 2013 Legislature.In a unanimous ruling, justices overturned a lower court judge and rejected arguments by Committee to Protect Nevada Jobs, a pro-business organization, that the initiative to impose a business margin tax was flawed.Critics argued that a required 200-word description of what the measure would do was misleading because it doesn't explain that the measure itself would not guarantee more money for education.During oral arguments in December, Josh …