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a in (-oo:+oo)
a/2 = 2/4 // - 2/4
a/2-(2/4) = 0
a/2-1/2 = 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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