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b in (-oo:+oo)
-4 = (-1/8)*b // - (-1/8)*b
-((-1/8)*b)-4 = 0
(1/8)*b-4 = 0
1/8*b-4 = 0 // + 4
1/8*b = 4 // : 1/8
b = 4/1/8
b = 32
b = 32
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