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b in (-oo:+oo)
-4*b-((4/7)*b)-(3/5) = 1419/35 // - 1419/35
-4*b-((4/7)*b)-(3/5)-(1419/35) = 0
(-4/7)*b-4*b-3/5-1419/35 = 0
-32/7*b-288/7 = 0 // + 288/7
-32/7*b = 288/7 // : -32/7
b = 288/7/(-32/7)
b = -9
b = -9
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