Pingvinus 12а-1=-а+25,
12а + а = 25 + 1
13а = 26
а = 26÷13 = 2

2-с=5с+1
2 - 1 = 5с + с
1 = 6с
с = 1÷6 = 1/6

8+3b=-7+2b
3b - 2b = - 7 - 8
b = - 15

-3d-10=3d-6
- 10 + 6 = 3d + 3 d
-4 = 6d
d = 4÷6 = 4/6 = 2/3

3y-3=5-y
3y + y = 5 + 8
4y = 8
y = 8÷4 = 2

-7-4x=-7x+5,
- 4x + 7x = 5 + 7
3x = 12
x = 12÷3 = 4