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a in (-oo:+oo)
(8/3)*a-2 = -1 // + 1
(8/3)*a-2+1 = 0
8/3*a-1 = 0 // + 1
8/3*a = 1 // : 8/3
a = 1/8/3
a = 3/8
a = 3/8
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