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Bonjour pouvez vous maidez svp a RESOUDRE LES EQUATION SUIVANTES: a; 2x +3 =5 B: 3x -7=5 c.3 - x= 7 d; 20 - 4x=12

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bonjour

2x + 3 = 5

2x = 5-3

2x = 2

x = 2/2

x = 1

3x - 7 = 5

3x = 7+5

3x = 12

x = 12/3

x = 4

3 - x = 7

- x = 7-3

x = -4

20 - 4x = 12

-4x = 12 - 20

-4x = - 8

x = -8/-4

x = 2

bonne journée

bonjour,  

a; 2x +3 =5

2x= 5-3

2x= 2

x= 2/2 =1

B: 3x -7=5

3x = 5+7

3x = 12

x= 12/3 = 4

c.3 - x= 7

3-7 = x

x= -4

d; 20 - 4x=12

20 -12 = 4x

8 = 4x

x= 8/4 = 2