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b in (-oo:+oo)
4.375 = (7/8)*(b-3) // - (7/8)*(b-3)
4.375-((7/8)*(b-3)) = 0
(-7/8)*(b-3)+4.375 = 0
4.375-7/8*(b-3) = 0
4.375-7/8*(b-3) = 0
7-7/8*b = 0
7-7/8*b = 0
7-7/8*b = 0 // - 7
-7/8*b = -7 // : -7/8
b = -7/(-7/8)
b = 8
b = 8
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