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