On note x le nombre choisi
5x + 40 = 10x - 20
5x = 10x - 60
- 5x = - 60
- 5x/-5 = - 60/-5
x = 12
Vérification
5 * 12 + 40 = 10 * 12 - 20
60 + 40 = 120 - 20
100 = 100
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On note x le nombre choisi
5x + 40 = 10x - 20
5x = 10x - 60
- 5x = - 60
- 5x/-5 = - 60/-5
x = 12
Vérification
5x + 40 = 10x - 20
5 * 12 + 40 = 10 * 12 - 20
60 + 40 = 120 - 20
100 = 100