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b in (-oo:+oo)
-(4*b)-1 = -49 // + 49
49-(4*b)-1 = 0
49-4*b-1 = 0
48-4*b = 0 // - 48
-4*b = -48 // : -4
b = -48/(-4)
b = 12
b = 12
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