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b in (-oo:+oo)
1/2 = 4*b // - 4*b
1/2-(4*b) = 0
1/2-4*b = 0
1/2-4*b = 0 // - 1/2
-4*b = -1/2 // : -4
b = -1/2/(-4)
b = 1/8
b = 1/8
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