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= -(-12) +/- akar ( 144 - 12 ) / 3 × 2
= 12 +/- akar 132 / 6
= 12 +/- 2 akar 33 / 6
x1 = 14 akar 33 / 6 = 7/3 akar 33
x2 = 12 - 2 akar 33