a) 4x+2+3x=5+2x+12 b) 5+(x+2)=(4x+1)+2 c) 3(x+2)=4'x+3) d) (3x+4)+(x+1)=2(x+2) Merci beaucoup !

A)  4x+2+3x=5+2x+12
      7x = 2x + 15
      5x = 15
      x = 3

B)  5+(x+2)=(4x+1)+2
     7+x = 4x+3
      -3x = -4
        x = 4/3
c) 3(x+2)=4(x+3)
    3x + 6 = 4x+12
    -6 = x

d) (3x+4)+(x+1)=2(x+2)
    3x+4+x+1 = 2x +4
    4x + 5 = 2x+4
     2x = -1
     x = -1/2

b = 5+(x+2) = (4x+1)+2
5+x+2=4x+1+2
x+7=4x+3
3x=4
x=4/3

c=    3(x+2) =4(x+3)
   3x+6 = 4x+12
         -x=6
         x=-6
d= (3x+4)+(x+1)=2(x+2)
3x+4+x+1=2x+4
4x+5=2x+4
2x=-1
x=-1/2

a=  4x+2+3x=5+2x+12
  7x+2=17+2x
  5x=15
x=15/5
x=3