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Sagot :

Explications étape par étape:

12x = 36

x = 36/12

x = 3

x/3 = 10

x = 10X3

x = 30

x-1 = 17

x = 17+1

x = 18

8x +3 = 27

8x = 27-3

8x = 24

x = 24/8 = 3

12 = 8x - 2

12+2 = 8x

14 = 8x

14/8 = x

x = 1,75

6 - x = 4

x = 4+6

x = 10

5 = x/2

5X2 = x

x = 10

15x = 20

x = 20/15

x = 1,3

12x - 20 = 3-4x

12x = 23 - 4x

16x = 23

x = 23/16 = 1,4

5(x+6)+1 = 10x - 9

5x +31 = 10x - 9

31 = 10x - 5x - 9

31 - 9 = 5x

x = 22/5

x = 4,4

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