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2(a) - 3(-5) = 6
2a + 15 = 6
2a = 6 - 15
2a = -9
a = -9/2
titik P (a,-5) terletak pd garis
sehingga
2a - 3(-5) = 6
2a + 15 = 6
2a = 6-15
2a = -9
a = -9/2