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(x + 1/2 a)² = 1 - a + 1/4 a²
(x + 1/2 a)² = (1/2 a - 1)²
x+ 1/2 a = 1/2 a - 1 atau x + 1/2 a = - 1/2 a + 1
x = -1 atau x = 1 - a