2.5х :14 = 1/4 : 30 36:35 = 1/5 х : 1/12
5x/2•1/14=1/4•30. 5x/28=1/120. 600x=28. x=7/150. 36/35=x/5•12. x/5=36/35•1/12. x=3/7.