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Sagot :

Bonjour,

1) 12+3x=7x+10

12-10 = 7x-3x

2 = 4x

x= 2/4 = 1/2=0,5

2) -3x-4=5+x

-4-5 = x+3x

-9 = 4x

x= -9/4

3) 4x-9= -6+12x

-9+6 = 12x-4x

-3 = 8x

x=  -3/8

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

5x+2x = -3 -2

7x = -5

x= -5/7

5) 4x -1=14+x

4x-x = 14 +1

3x= 15

x= 15/3 = 5

6) -0,1+6x= -8x+0,1​

6x+8x = 0,1 +0,1

14x = 0,2

x= 0,2/14

x= 0,1/7 =  1/70

DOUCEPATATE

Bonjour,

1) 12 + 3x = 7x + 10

12 = 4x + 10

2 = 4x

2/4 = x

1/2 = x = 0,5

2) -3x - 4 = 5 + x

-4x - 4 = 5

-4x = 9

x = -9/4

3) 4x - 9 = -6 + 12x

- 9 = -6 + 8x

-3 = 8x

-3/8 = x

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

2 + 7x = -3

7x = -5

x = -5/7

5) 4x -1  =14 + x

3x - 1 = 14

3x = 15

x = 15/3 = 5

6) -0,1+6x= -8x+0,1​

6x = -8x + 0,2

14x = 0,2

x = 0,2/14 = 1/70

Bonne journée :D

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