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a= x+1 --> x = a -1 sub ke PK lama
3(a-1)^2 - (a-1) - 2 = 0
2(a^2 - 2a+ 1) - a + 1 - 2 = 0
2 a^2 - 4a + 1 - a - 1= 0
2a^2 - 5a = 0
atau
2x^2 - 5x = 0