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b in (-oo:+oo)
7*(1*b-1) = -21 // + 21
7*(1*b-1)+21 = 0
7*(b-1)+21 = 0
7*(b-1)+21 = 0
7*b+14 = 0
7*b+14 = 0
7*b+14 = 0 // - 14
7*b = -14 // : 7
b = -14/7
b = -2
b = -2
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