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b in (-oo:+oo)
b-(41/4) = 21/3-(11/4) // - 21/3-(11/4)
b-(41/4)-(21/3)+11/4 = 0
b-41/4+11/4-7 = 0
b-29/2 = 0 // + 29/2
b = 29/2
b = 29/2
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