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a in (-oo:+oo)
(1/2)*a-(1/2) = -3 // + 3
(1/2)*a-(1/2)+3 = 0
(1/2)*a-1/2+3 = 0
1/2*a+5/2 = 0 // - 5/2
1/2*a = -5/2 // : 1/2
a = -5/2/1/2
a = -5
a = -5
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