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a in (-oo:+oo)
(1-(3*(a-1)))/8 = 0
(1-3*(a-1))/8 = 0
1-3*(a-1) = 0
1-3*(a-1) = 0
4-3*a = 0
4-3*a = 0
(4-3*a)/8 = 0
4-3*a = 0 // - 4
-3*a = -4 // : -3
a = -4/(-3)
a = 4/3
a = 4/3
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