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