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b in (-oo:+oo)
b-7 = (6/7)*b-(342/49) // - (6/7)*b-(342/49)
b-((6/7)*b)+342/49-7 = 0
b+(-6/7)*b+342/49-7 = 0
1/7*b-1/49 = 0 // + 1/49
1/7*b = 1/49 // : 1/7
b = 1/49/1/7
b = 1/7
b = 1/7
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