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b in (-oo:+oo)
-1 = b+4*(6/7) // - b+4*(6/7)
-b-(4*(6/7))-1 = 0
-b-24/7-1 = 0
-b-31/7 = 0 // + 31/7
-b = 31/7 // * -1
b = -31/7
b = -31/7
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