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