Bonjour, j'aimerais que vous m'aideriez a faire ses 4 equations : a) 3(2x+5)-2(7x-3)=2x+1 b)5(3x-1)-2(x+7)=2(x-1) c)-4(3x-5)+2(x-7)=5 d)-2(-x+8)+3(2x+1)=2x-1 me

bonjour

a) 3 ( 2 x + 5 ) - 2 ( 7 x - 3) = 2 x + 1

   6 x + 15 - 14 x + 6 = 2 x + 1

   - 8 x - 2 x = 1 - 15 -  6

   - 10 x = - 20

        x = 2

b )5(3 x-1)-2(x+7)=2(x-1)

   15 x - 5 - 2 x - 14  = 2 x - 2

   13 x - 19 = 2 x - 2

   13 x - 2 x = - 2 + 19

   11 x = 17

      x = 17/11

c)-4(3x-5)+2(x-7)=5

  - 12 x + 20 + 2 x - 14 = 5

  - 10 x = 5 - 20 + 14

   - 10 x = - 1

     x = 1/10

d)-2(-x+8)+3(2x+1)=2x-1

  2 x - 16 + 6 x + 3 = 2 x - 1

  8 x - 2 x = - 1 + 16 - 3

  6 x = 12

     x = 2

bonjour

3(2x+5)-2(7x-3) = 2x+1

6x+15-14x+6 = 2x+1

-8x+21 = 2x+1

-8x-2x = -21+1

-10x = -20

x= -20/-10

x = 2

5(3x-1)-2(x+7) = 2(x-1)

15x - 5 -2x -14 = 2x-2

13x -19 = 2x -2

13x-2x = 19-2

11x = 17

x= 17/11

-4(3x-5)+2(x-7) = 5

-12x+20+2x-14 = 5

-10x+6 = 5

-10x = -6+5

-10x= -1

x= 1/10

-2(-x+8)+3(2x+1)=2x-1

2x-16+6x+3 = 2x-1

8x -13 = 2x-1

8x -2x = 13-1

6x = 12

x = 12/6

x = 2