Question

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

Answer 1

60/13-у-81/13=49/13

60/13-81/13-49/13=у

(60-81-49)13=у

у=-7013

у=-5целых 5/13

Answer 2

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

6013-у -8113=4913

-у=7013

у=- 5  513