Question

2,3у+31+2,5у=67. 13+3,2х+0,4=40

Answer 1

2,3у+31+2,5у=67
4,8у=67-31
4,8у=36
у=36:4,8
у=7,5
.....................
13+3,2х+0,4=40
3,2х=40-13-0,4
3,2х=26.6
х=8,3125