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a in (-oo:+oo)
(1/2)*a-(1/2) = -6 // + 6
(1/2)*a-(1/2)+6 = 0
(1/2)*a-1/2+6 = 0
1/2*a+11/2 = 0 // - 11/2
1/2*a = -11/2 // : 1/2
a = -11/2/1/2
a = -11
a = -11
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