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b in (-oo:+oo)
(1/6)*b+2/3 = -8 // + 8
(1/6)*b+2/3+8 = 0
1/6*b+26/3 = 0 // - 26/3
1/6*b = -26/3 // : 1/6
b = -26/3/1/6
b = -52
b = -52
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