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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
688/516 = 4/b // - 4/b
688/516-(4/b) = 0
688/516-4*b^-1 = 0
-4*b^-1 = -4/3 // : -4
b^-1 = 1/3
-1 < 0
1/(b^1) = 1/3 // * b^1
1 = 1/3*b^1 // : 1/3
3 = b^1
b = 3
b = 3
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