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b in (-oo:+oo)
6 = -b/8 // + -b/8
6-(-b/8) = 0
(1/8)*b+6 = 0
1/8*b+6 = 0 // - 6
1/8*b = -6 // : 1/8
b = -6/1/8
b = -48
b = -48
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