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