Question

решите уровнение х+23=18, -31-х=-9

Answer 1

х+23=18
х=18-23
х=-5

-31-х=-9
-х=-9+31
-х=22
х=-22

Answer 2

х+23=18
х=18-23
х=-5
Проверка:-5+23=18, 18=18

-31-х=-9
-х=-9+31
-х=22
х=-22
Проверка: -31-(-22)=-9, -31+22=-9, -9=-9