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Didapat:
-2 = (a+3)(1)² + (a+1)(1) + a
-2 = a+3 + a+1 + a
-2 = 3a + 4
3a = -2-4
3a = -6
Didapat hasil akhir:
a = -2
-2 = (a+3) 1 + (a+1) 1 + a
-2 = 3a + 4
a = -2