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Persamaannya :
3a + 5b = - 1.......> kali 5
5a - 6b = -16......> kali 3
15a + 25b = -5
15a - 18b = -48 -
43b = 43
b = 1
3a + 5b = -1
3a = - 1 - 5
a = - 2