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b in (-oo:+oo)
(3/10+4)*b+5/12 = (1/5+3)*b-((3/4)*b)-(5/6) // - (1/5+3)*b-((3/4)*b)-(5/6)
(3/10+4)*b-((1/5+3)*b)+(3/4)*b+5/12+5/6 = 0
37/20*b+5/4 = 0 // - 5/4
37/20*b = -5/4 // : 37/20
b = -5/4/37/20
b = -25/37
b = -25/37
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