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a in (-oo:+oo)
(1/2)*a-(1/2) = -2 // + 2
(1/2)*a-(1/2)+2 = 0
(1/2)*a-1/2+2 = 0
1/2*a+3/2 = 0 // - 3/2
1/2*a = -3/2 // : 1/2
a = -3/2/1/2
a = -3
a = -3
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