Question

Решыте пожалуста даю 30 балов СРОЧНО

Answer 1

4/7(0,56-4,2y)+0,4=5/13(0,52-6,5y)

4/7*(14/25-21/5y)+2/5=5/13*(13/25-13/2y)

8/25-12/5y+2/5=1/5-5/2y

18/25-12/5y=1/5-5/2y

36-120y=10-125y

-120y+125y=10-36

5y=-26

y=-26/5

y=-5,2