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b in (-oo:+oo)
56 = (4*b)/2 // - (4*b)/2
56-((4*b)/2) = 0
56-2*b = 0
56-2*b = 0 // - 56
-2*b = -56 // : -2
b = -56/(-2)
b = 28
b = 28
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