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a in (-oo:+oo)
(2*(8-1))/3 = 4-(4*a) // - 4-(4*a)
4*a+(2*(8-1))/3-4 = 0
4*a+2/3 = 0 // - 2/3
4*a = -2/3 // : 4
a = -2/3/4
a = -1/6
a = -1/6
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