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b in (-oo:+oo)
7*(1*b+8) = 77 // - 77
7*(1*b+8)-77 = 0
7*(b+8)-77 = 0
7*(b+8)-77 = 0
7*b-21 = 0
7*b-21 = 0
7*b-21 = 0 // + 21
7*b = 21 // : 7
b = 21/7
b = 3
b = 3
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