(12*5/13-Y)-9*9/13=7*7/13

Question

(12*5/13-Y)-9*9/13=7*7/13

Answer 1

(12*5/13-Y)-9*9/13=7*7/13

60\13-у -81\13=49\13

-у=70\13

у=- 5  5\13

 

Answer 2

60/13-у-81/13=49/13

60/13-81/13-49/13=у

(60-81-49)\13=у

у=-70\13

у=-5целых 5/13