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b in (-oo:+oo)
6.125 = (7/8)*(b-2) // - (7/8)*(b-2)
6.125-((7/8)*(b-2)) = 0
(-7/8)*(b-2)+6.125 = 0
6.125-7/8*(b-2) = 0
6.125-7/8*(b-2) = 0
7.875-7/8*b = 0
7.875-7/8*b = 0
7.875-7/8*b = 0 // - 7.875
-7/8*b = -7.875 // : -7/8
b = -7.875/(-7/8)
b = 9
b = 9
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