Sagot :

sarah21374

bonjour,

a. 3x+7=2x+5

3x-2x=5-7

x=5-7

x=-2

b. 4x-11=3x-17

4x-3x=-17+11

x=-17+11

x=-6

c. 13-5x=21-4x

-5x+4x=21-13

-x=21-13

-x=8

x=-8

d. 9-3x=2x+23

-3x-2x=23-9

-5x=23-9

-5x=14

x=-14/5

voila

jespere que je tai aide
Bonjour,

a. 3x+7 = 2x+5
3x = 2x-2
x = -2

b. 4x-11 = 3x-17
4x = 3x-6
x=-6

c. 13-5x = 21-4x
-5x = -4x+8
-x = 8
x=-8

d. 9-3x = -2x+23
-3x = -2x+14
-x = 14
x=-14

Voilà :)