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-18+4A+2B=0
4A+2B= 18... persamaan 1
p(-1) = -3+2+A-B-8=0
-9+A-B=0
A-B=9... persamaan 2
eliminasi persamaan 1&2
4A+2B=18 (x1)
A-B=9 (x2)
=> 4A+2B=18
2A-2B=18 (jumlahkan)
6A=0, A=0
B=9