Question

Решите уравнение x-3/7 x=2,8

Answer 1

х- 3/7х= 2,8
( 1- 3/7)*х=2 4/5
(7/7-3/7)*х= 2 4/5
4/7х= 2 4/5
х= 2 4/5: 4/7
х= 14/5* 7/4
х= 98/20
х=4 18/20
х= 4 9/10
х= 4,9