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b in (-oo:+oo)
7*b+7*b+1 = -17/4 // + -17/4
7*b+7*b-(-17/4)+1 = 0
7*b+7*b+17/4+1 = 0
14*b+21/4 = 0 // - 21/4
14*b = -21/4 // : 14
b = -21/4/14
b = -3/8
b = -3/8
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