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Sagot :

Bonjour,

2(x+1)=17

2x+2 = 17

2x = 17-2

2x= 15

x= 15/2 = 7,5

3x-1=23

3x= 23 +1

3x= 24

x= 24/3 = 8

2x+7 =31

2x= 31-7

2x= 24

x= 24/2 = 12

X-5 =9

x= 9+5

x= 14

X+3 =13

x= 13-3

x= 10

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