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a in (-oo:+oo)
(1/3)*a-((1/2)*a) = 1/2-1 // - 1/2-1
(1/3)*a-((1/2)*a)-(1/2)+1 = 0
(1/3)*a+(-1/2)*a-1/2+1 = 0
1/2-1/6*a = 0 // - 1/2
-1/6*a = -1/2 // : -1/6
a = -1/2/(-1/6)
a = 3
a = 3
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