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b in (-oo:+oo)
1.857 = (3/8)*(b-2) // - (3/8)*(b-2)
1.857-((3/8)*(b-2)) = 0
(-3/8)*(b-2)+1.857 = 0
1.857-3/8*(b-2) = 0
1.857-3/8*(b-2) = 0
2.607-3/8*b = 0
2.607-3/8*b = 0
2.607-3/8*b = 0 // - 2.607
-3/8*b = -2.607 // : -3/8
b = -2.607/(-3/8)
b = 6.952
b = 6.952
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