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