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b in (-oo:+oo)
1/4-2*b = -47/4 // + -47/4
1/4-2*b-(-47/4) = 0
1/4-2*b+47/4 = 0
12-2*b = 0 // - 12
-2*b = -12 // : -2
b = -12/(-2)
b = 6
b = 6
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