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b in (-oo:+oo)
(3/7)*b-b+1/2 = 5/42 // - 5/42
(3/7)*b-b+1/2-(5/42) = 0
(3/7)*b-b+1/2-5/42 = 0
8/21-4/7*b = 0 // - 8/21
-4/7*b = -8/21 // : -4/7
b = -8/21/(-4/7)
b = 2/3
b = 2/3
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