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b in (-oo:+oo)
(3/5)*b+42.5 = b // - b
(3/5)*b-b+42.5 = 0
42.5-2/5*b = 0 // - 42.5
-2/5*b = -42.5 // : -2/5
b = -42.5/(-2/5)
b = 106.25
b = 106.25
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