Solving Inequalities with Parameters: A Comprehensive Guide
Translation:
① When 'm+n>0', or 'm>-n', the solution set is 'x < -9/(m+n)'.
② When 'm+n < 0', or 'm < -n', the solution set is 'x>-9/(m+n)'.
③ When 'm+n=0', or 'm=-n', the inequality has no solution.
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