Réponse :
bonsoir
Explications étape par étape :
a) 8x + 1 = 5x + 4
→ 8x - 5x = 4 - 1
→ 3x = 3
→ x = 3/3
→ x = 1
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b) 3x + 7 = x + 13
→ 3x - x = 13 - 7
→ 2x = 6
→ x = 6/2
→ x = 3
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c) 8x + 2 = 2x + 20
→ 8x - 2x = 20 - 2
→ 6x = 18
→ x = 18/6
→ x = 3
bonne soirée
