Sagot :

maudmarine

Bonjour,

Résoudre les équation suivantes :

a)13+4x=21

4x = 21 - 13

4x = 8

x = 8/4

x = 2

b)3x-7=5

3x = 5 + 7

3x = 12

x = 12/37 x = 4

c)5x=2x+1

5x - 2x = 1

3x = 1

x = 1/3

d) 8x+3=x+15

8x - x = 15 - 3

7x = 12

x = 12/7