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⇔ 2y + y = 11 + 4
⇔ 3y = 15
∴ y = 5
⇨ 2y -4 = 11-y
⇨ 2y+y = 11+4
⇨3y = 15 || bagikan dengan 3,sehingga menjadi ⇩⇩
⇨ y = 5
Semoga membantu.