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a in (-oo:+oo)
(1/2)*a-(1/2) = 0
(1/2)*a-1/2 = 0
1/2*a-1/2 = 0 // + 1/2
1/2*a = 1/2 // : 1/2
a = 1/2/1/2
a = 1
a = 1
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