Question

Срочно помогите !!! Помогите помогите​

Answer 1

$\displaystyle (12\frac{5}{13}+y)-9\frac{9}{13}=7\frac{7}{13}\\\\(\frac{161}{13}+y)-\frac{126}{13}=\frac{98}{13}\\\\\frac{161}{13}+y-\frac{126}{13}=\frac{98}{13}\\\\\frac{35}{13}+y=\frac{98}{13}\\\\y=\frac{98}{13}-\frac{35}{13}\\\\y=\frac{63}{13}=4\frac{11}{13}$