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b in (-oo:+oo)
1-(7*b) = 85 // - 85
1-(7*b)-85 = 0
1-7*b-85 = 0
-7*b-84 = 0 // + 84
-7*b = 84 // : -7
b = 84/(-7)
b = -12
b = -12
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