Помогите решить уравнение:

1) 3,557+x/2=4;

2) x-0,731/3=5;

3) 12,392+x/5=2,365+2,635;

4) 125,95-x/2,65+4,35=6;

Образец: 4,907+y/3=4; (4,907+y) : 3=4; 4,907+y=12;

Y=12-4,907; Y=7,093

(3,557 + х) / 2 = 4

(3,557 + х) : 2 = 4

3,557 + х = 4 * 2

3,557 + х = 8

х = 8 - 3,557

х = 4,443

(х-0,731) / 3 = 5

(х - 0,731) : 3 = 5

х - 0,731 = 5*3

х - 0,731 = 15

х = 15 + 0,731

х = 15,731

(12,392 + х) / 5 = 2,365 + 2,635

(12,392 + х) : 5 = 5

12,392+х = 5*5

12,392 + х = 25

х = 25 - 12,392

х=12,608

(125,95 - х) / (2,65 + 4,35) = 6

(125,95 - х) : 7 = 6

125,95 - х = 6*7

х = 125,95 - 42

х = 83,95