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b in (-oo:+oo)
39 = 1-((3/10)*b) // - 1-((3/10)*b)
(3/10)*b-1+39 = 0
3/10*b+38 = 0 // - 38
3/10*b = -38 // : 3/10
b = -38/3/10
b = -380/3
b = -380/3
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