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