bjr
6x - 4 = 26
6x - 4 + 4 = 26 + 4
6x = 30
6x/6 = 30/6
x = 5
vérif 6*5 - 4 = 30 - 4 = 26
7x - 2 = 5x + 6
7x - 2 + 2 = 5x + 6 + 2
7x = 5x + 8
7x - 5x = 5x - 5x + 8
2x = 8
2x/2 = 8/2
x = 4
vérif : 7*4 - 2 = 28 - 2 = 26
et 5*4 + 6 = 20 + 6 = 26
de même pour les deux autres
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bjr
6x - 4 = 26
6x - 4 + 4 = 26 + 4
6x = 30
6x/6 = 30/6
x = 5
vérif 6*5 - 4 = 30 - 4 = 26
7x - 2 = 5x + 6
7x - 2 + 2 = 5x + 6 + 2
7x = 5x + 8
7x - 5x = 5x - 5x + 8
2x = 8
2x/2 = 8/2
x = 4
vérif : 7*4 - 2 = 28 - 2 = 26
et 5*4 + 6 = 20 + 6 = 26
de même pour les deux autres