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x² - 4x - 3x + 12 = 12x - 76
x² - 7x -12x = -76 -12
x² - 19x + 88 = 0
(x - 11)(x - 8) = 0
x = 11 / x = 8
Mohon ma'af bila ada kesalahan atau kehilafan saya. Terimakasih:).