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b in (-oo:+oo)
(1/7)*b+1/2 = 7*b-(1145/14) // - 7*b-(1145/14)
(1/7)*b-(7*b)+1/2+1145/14 = 0
(1/7)*b-7*b+1/2+1145/14 = 0
576/7-48/7*b = 0 // - 576/7
-48/7*b = -576/7 // : -48/7
b = -576/7/(-48/7)
b = 12
b = 12
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