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exercice 5
Indiquer si les équations suivantes ont les mêmes solutions.
a) x + 2 = 3 4x+8=12 ....
b) x+4=7 -6x+18=30 ....
c) x+4=7 5x+20=7 .....​

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x + 2 = 3

x = 3 - 2

x = 1

4 x + 8 = 12

4 x = 12 - 8

4 x =  4

x =  1

x + 4 = 7

x =  3

- 6 x + 18 = 30

- 6 x = 30 - 18 = 12

x  = - 2

x+ 4 = 7

x =  3

5 x + 20 = 7

5 x =  -  7 - 20 = - 27

x =  - 27/5

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