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b in (-oo:+oo)
(4/7)*b+1 = (-4/5)*b+83/35 // - (-4/5)*b+83/35
(4/7)*b-((-4/5)*b)-(83/35)+1 = 0
(4/7)*b+(4/5)*b-83/35+1 = 0
48/35*b-48/35 = 0 // + 48/35
48/35*b = 48/35 // : 48/35
b = 48/35/48/35
b = 1
b = 1
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