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b in (-oo:+oo)
4*(4-1*b) = -16 // + 16
4*(4-1*b)+16 = 0
4*(4-b)+16 = 0
4*(4-b)+16 = 0
32-4*b = 0
32-4*b = 0
32-4*b = 0 // - 32
-4*b = -32 // : -4
b = -32/(-4)
b = 8
b = 8
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