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Kalo "oleh" yang didepan berarti yang 3(y-1)
Penyelesaian:
2 x 7 = 14
2 x y = 2y
3 x y = 3y
3 x 1 = 3
14 - 2y - 3y - 3
Jawab: .....
Sendiri ya aku lupa caranya. takut salah xD