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b in (-oo:+oo)
4.375 = (7/8)*(b-2) // - (7/8)*(b-2)
4.375-((7/8)*(b-2)) = 0
(-7/8)*(b-2)+4.375 = 0
4.375-7/8*(b-2) = 0
4.375-7/8*(b-2) = 0
6.125-7/8*b = 0
6.125-7/8*b = 0
6.125-7/8*b = 0 // - 6.125
-7/8*b = -6.125 // : -7/8
b = -6.125/(-7/8)
b = 7
b = 7
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