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b in (-oo:+oo)
7-7*b = 2*b-101 // - 2*b-101
7-7*b-(2*b)+101 = 0
7-7*b-2*b+101 = 0
108-9*b = 0 // - 108
-9*b = -108 // : -9
b = -108/(-9)
b = 12
b = 12
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