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b in (-oo:+oo)
(14/3)*b+4/5 = (15/7)*b-((1/5)*b)-(1/3) // - (15/7)*b-((1/5)*b)-(1/3)
(14/3)*b-((15/7)*b)+(1/5)*b+4/5+1/3 = 0
(14/3)*b+(-15/7)*b+(1/5)*b+4/5+1/3 = 0
286/105*b+17/15 = 0 // - 17/15
286/105*b = -17/15 // : 286/105
b = -17/15/286/105
b = -119/286
b = -119/286
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