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