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b in (-oo:+oo)
(5/7)*b-(1/2) = -1/12 // + -1/12
(5/7)*b-(1/2)-(-1/12) = 0
(5/7)*b-1/2+1/12 = 0
5/7*b-5/12 = 0 // + 5/12
5/7*b = 5/12 // : 5/7
b = 5/12/5/7
b = 7/12
b = 7/12
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