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b in (-oo:+oo)
657/175 = (4/5)*b+3*b+5/7 // - (4/5)*b+3*b+5/7
657/175-((4/5)*b)-(3*b)-(5/7) = 0
(-4/5)*b-3*b+657/175-5/7 = 0
76/25-19/5*b = 0 // - 76/25
-19/5*b = -76/25 // : -19/5
b = -76/25/(-19/5)
b = 4/5
b = 4/5
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