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b in (-oo:+oo)
6-((2*b)/4) = 5 // - 5
6-((2*b)/4)-5 = 0
(-1/2)*b-5+6 = 0
1-1/2*b = 0 // - 1
-1/2*b = -1 // : -1/2
b = -1/(-1/2)
b = 2
b = 2
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