Sagot :

Bonsoir,

a) 3x + 5 = 4x - 7

5+7 = 4x +3x

12 = 7x

x= 12/7

c)-2x + 3 = 3x - 1

3+1 = 3x +2x

4 = 5x

x= 4/5

e)1+3 /10x=4-2 /5x​

3/10 x +2/5x = 4-1

3/10x + 4/10x = 3

7/10x = 3

10x = 3/7

x= (3/7)/10

x= 3/70

louanftn
Hellooo alors :

a) 3x + 5 = 4x - 7
-1x + 5 = -7
-1x = -2
x = 2

c) -2x + 3 = 4x - 7
-6x + 3 = -7
-6x = -4
x = -4/-6
x = 4/6

Je n’ai pas compris la dernière désolé !!