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b in (-oo:+oo)
2*(4-(2*b)) = -8 // + 8
2*(4-(2*b))+8 = 0
2*(4-2*b)+8 = 0
2*(4-2*b)+8 = 0
16-4*b = 0
16-4*b = 0
16-4*b = 0 // - 16
-4*b = -16 // : -4
b = -16/(-4)
b = 4
b = 4
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