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b in (-oo:+oo)
-4 = (-16/1)*b // - (-16/1)*b
-((-16/1)*b)-4 = 0
16*b-4 = 0
16*b-4 = 0 // + 4
16*b = 4 // : 16
b = 4/16
b = 1/4
b = 1/4
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