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