Question

7+2х-х=14 -2+9+х=8. 15-x=20​

Answer 1

Ответ:

$7 + 2x - x = 14 \\ 7 + x = 14 \\ x = 14 - 7 \\ x = 7$

$- 2 + 9 + x = 8 \\ 7 + x = 8 \\ x = 8 - 7 \\ x = 1$

$15 - x = 20 \\ - x = 20 - 15 \\ - x = 5 \\ x = - 5$