If I understand ur question, u r looking for a solution set with no solutions. - 2m + 5 = - 2m - 5 -2m + 2m = -5 - 5 0 = -10 (incorrect...no solution)
u want the answer to be unequal with no variables. U do not want the answers to be equal, such as 0 = 0 or 10 = 10...because that would indicate infinite solutions. And u do not want the answer to contain a variable, because that would indicate 1 solution.