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b in (-oo:+oo)
49 = (7/8)*b // - (7/8)*b
49-((7/8)*b) = 0
(-7/8)*b+49 = 0
49-7/8*b = 0 // - 49
-7/8*b = -49 // : -7/8
b = -49/(-7/8)
b = 56
b = 56
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