Question

Решить уравнение:5/7(5,6-2,1y)=2,4(5/8-2/3y ДАЮ 20 БАЛОВ

Answer 1

5/7( 28/5 - 21/10у ) = 12/5( 5/8 - 2/3у )

28/7 - 3/2у = 3/2 - 8/5у  

3/2у - 8/5у = 28/7 - 3/2

14 • ( - у ) = 10 • 35

- 14у = 350  

-y = 350 : 14

у = - 25