Question

Решите уравнение 1,25(x+x+20)=200.

Answer 1

2х+20=200:1,25
2х=160-20
2х=140
х=70

Answer 2

1,25(х+х+20)=200
1,25(2х+20)=200
2,5х+25=200
2,5х=200-25
2,5х=175
х=175/2,5
х=70