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b in (-oo:+oo)
b/2-5 = 51/2 // - 51/2
b/2-(51/2)-5 = 0
b/2-51/2-5 = 0
1/2*b-61/2 = 0 // + 61/2
1/2*b = 61/2 // : 1/2
b = 61/2/1/2
b = 61
b = 61
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