(x+25)-(x-12)=13
x + 25 – x + 12 = 13
x – x = 13 – 12 – 25
0x = -24
уравнение решений не имеет
(x-12)+(16-2x)=14
x – 12 + 16 – 2x = 14
x – 2x = 14 – 16 + 12
-x = 10
x = -10
(x+25)-(x-12)=13
x + 25 – x + 12 = 13
x – x = 13 – 12 – 25
0x = -24
уравнение решений не имеет
(x-12)+(16-2x)=14
x – 12 + 16 – 2x = 14
x – 2x = 14 – 16 + 12
-x = 10
x = -10