II. Find every value of the variable that makes each rational expression undefined. 6. \frac{3x}{x-2} 7. \frac{5r}{r-9} 8. \frac{7}{14x-28} 9. \frac{2x+5}{x+10} 10. \frac{4y}{y+6} 11. \frac{3x}{4x+15} 12. \frac{2m+3}{8+m} 13. \frac{5x}{5x-5} 14. \frac{4}{x-25} 15. \frac{9}{2q+3} 16. \frac{3}{4-x} 17. \frac{2x-3}{9-x} 18. \frac{x-2}{2x-3} 19. \frac{x^2+3x-4}{x+2} 20. \frac{x^2+5x+6}{4x+3}
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