(x−1)−(x−1)
2
+a(x−1)
=(x−1)(1−(x−1)+a)
=(x−1)(1−x+1+a)
=(x−1)(2+a−x)
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(x−1)−(x−1)
2
+a(x−1)
=(x−1)(1−(x−1)+a)
=(x−1)(1−x+1+a)
=(x−1)(2+a−x)