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solve the LP problems. If no optimal solution exists indicate weather the problem is feasible region is empty or the objective is unbounded. Minimize c= 2x -2y subject to x/6 is less then or equal to y, y<2x/5 , x+y is more then or equal to 7, x + 2y is less then or equal 20, x is more then or equal to 0, y is more then or equal to 0. Min c=? X=? and Y=?