Bonjour,
4/5 + x = 9/7
⇔ 4/5 + x - 4/5 = 9/7 - 4/5
⇔ x = 9/7 - 4/5
⇔ x = (9 × 5)/(7 × 5) - (4 × 7)/(5 × 7)
⇔ x = 45/35 - 28/35
⇔ x = 17/35
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Bonjour,
4/5 + x = 9/7
⇔ 4/5 + x - 4/5 = 9/7 - 4/5
⇔ x = 9/7 - 4/5
⇔ x = (9 × 5)/(7 × 5) - (4 × 7)/(5 × 7)
⇔ x = 45/35 - 28/35
⇔ x = 17/35