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karena bilangan pokoknya sama, bisa di coret aja....
-1(x² + 3) = -2(2x)
-x² - 3 = -4x
-x² - 3 + 4x = 0 --------> kalikan dgn min 1
x² -4x + 3
(x -1) ( x -3)
x -1 = 0 atau x - 3 = 0
x = 1 x = 3