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b in (-oo:+oo)
(3/5)*(7*b-1) = b-5 // - b-5
(3/5)*(7*b-1)-b+5 = 0
3/5*(7*b-1)-b+5 = 0
3/5*(7*b-1)-b+5 = 0
16/5*b-3/5+5 = 0
16/5*b+22/5 = 0
16/5*b+22/5 = 0
16/5*b+22/5 = 0 // - 22/5
16/5*b = -22/5 // : 16/5
b = -22/5/16/5
b = -11/8
b = -11/8
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