2/3у- 1/3=59у
3/4у-2/3=7/12у

2/3у - 1/3 = 59у2/3у - 59у = 1/3- 58 1/3у = 1/3  у = 1/3 : (- 58 1/3)  у = - (1/3 : 175/3)   у = - 1/175------------------------------------------3/4у - 2/3 = 7/12у3/4у - 7/12у = 2/39/12у - 7/12у = 2/32/12у = 2/31/4у = 2/3  у = 2/3 : 1/4  у = 8/3  у = 2 2/3