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b in (-oo:+oo)
1/13 = b/13 // - b/13
1/13-(b/13) = 0
1/13-1/13*b = 0 // - 1/13
-1/13*b = -1/13 // : -1/13
b = -1/13/(-1/13)
b = 1
b = 1
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