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(9x² - 3x - 3x + 1) + 4x² = 16x² -8x - 8x + 4
9x² - 6x + 1 + 4x² = 16x² -16x + 4
13x² = 16x² - 16x + 6x + 4-1
3x² -10x + 3 = 0
(3x - 1) ( x -3)
jadi x = 3
3x - 1 = 3*3 - 1 = 8
2x = 2*3 = 6
4x - 2 =4*3 - 2 = 10
8² + 6² = 10²
64 + 36 = 100