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