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b in (-oo:+oo)
b+7*b+4/7 = -668/7 // + -668/7
b+7*b+4/7-(-668/7) = 0
b+7*b+4/7+668/7 = 0
8*b+96 = 0 // - 96
8*b = -96 // : 8
b = -96/8
b = -12
b = -12
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