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b in (-oo:+oo)
1-(6*b) = 19 // - 19
1-(6*b)-19 = 0
1-6*b-19 = 0
-6*b-18 = 0 // + 18
-6*b = 18 // : -6
b = 18/(-6)
b = -3
b = -3
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