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Kalikan 6 dengan -3 menjadi -18
Didapat :
a = -9, b = 2
a+b = -7
ab = 18
Jangan lupa beri 1/6
1/6 (6x-9)(6x+2)
1/6 3(2x-3) 2(3x+1)
(2x-3)(3x+1)
(2x + 3) (3x - 1)