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