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x= x1+ 3 -->.x1 = x- 3 sub ke persmaan
2(x-3)² - 3(x-3) + 4 = 0
2(x²-6x+9) - 3x +9 + 4 = 0
2x² -12x + 18 - 3x + 13 =0
2x² - 15x + 31= 0