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b in (-oo:+oo)
7*(2*b+1) = 105 // - 105
7*(2*b+1)-105 = 0
7*(2*b+1)-105 = 0
14*b-98 = 0
14*b-98 = 0
14*b-98 = 0 // + 98
14*b = 98 // : 14
b = 98/14
b = 7
b = 7
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