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b in (-oo:+oo)
-7*b-1 = 9/5 // - 9/5
-7*b-(9/5)-1 = 0
-7*b-9/5-1 = 0
-7*b-14/5 = 0 // + 14/5
-7*b = 14/5 // : -7
b = 14/5/(-7)
b = -2/5
b = -2/5
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