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b in (-oo:+oo)
b/10.5 = 157.5/52.5 // - 157.5/52.5
b/10.5-(157.5/52.5) = 0
b/10.5-3 = 0
0.0952381*b-3 = 0 // + 3
0.0952381*b = 3 // : 0.0952381
b = 3/0.0952381
b = 31.49999843
b = 31.49999843
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