a. x + 5 = 1
=> x = -4
b. 12 + x = 5
= > x = -7
с x - 11 = 4
=> x = 15
c. 24-x=57
=> x = -23
d. (x + 3) -5=-1
=> x + 3 = 4
=> x = -1
i, (7 + x) +15=-12
=> 7+x = -27
=> x = -34
g 13-(2-x) = -9
=> 2-x = 22
=> x = -20

a) x +5 = 1 
    x = 1-5 
     x= -4
b) 
12 + x = 5
        x = 5-12 
        x = -7
c) 
 x - 11 = 4
 x  = 4+11
 x = 15
d) 24 - x = 57
           x = 24 - 57 
           x =-33
e) ( x +3 ) - 5 = 1 
      x + 3= 1+5 
      x + 3 = 6 
      x = 6-3
      x =3 
 

a) x= 1-5=-4
b) x = 12-5 = 7
c) x = 4 + 11= 15
d) x = 24 - 57=-33
e) x+ 3 = 4
=> x = 1
f) 7+ x = 3
=> x = -4
g) 2-x = 22
=> x= -20