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bukti :
5.2- 1 = 9
10 -1 = 9
5.3 - 6 = 9
15 - 6 = 9
y - 1 / 6 - 1 = x - 2/ 3 - 2
y - 1 / 5 = x - 2/ 1
y - 1 = 5x - 10
5× - y = 9