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