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x - y = 7
x = 2y - 1
Jawab :
2y - 1 - y = 7 (x ganti dengan 2y - 1)
y - 1 = 7
y = 8
Substitusi
x - y = 7
x - 8 = 7
x = 15
Jadi bilangannya adalah 15 dan 8