2421 = 49 25 50x 12 18x 25 13 39 26 12,3 7x 60 = 4,2 270,2:(x-2)=: 2를 282 5x-2 = 5 6 2x+3 = 7 292

24. $$ \frac{21}{25} = \frac{49}{50x} $$

25. $$ \frac{12}{13} = \frac{18x}{39} $$

26. $$ \frac{12,3}{60} = \frac{7x}{4,2} $$

27. $$ 0,2 : (x-2) = \frac{1}{2} : 2\frac{1}{2} $$

28. $$ \frac{2}{6} = \frac{5x-2}{2x+3} $$

29.