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b in (-oo:+oo)
b+1/2 = 7*b-136 // - 7*b-136
b-(7*b)+1/2+136 = 0
b-7*b+1/2+136 = 0
273/2-6*b = 0 // - 273/2
-6*b = -273/2 // : -6
b = -273/2/(-6)
b = 91/4
b = 91/4
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