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b in (-oo:+oo)
4*b+(5/6)*b+6/7 = 311/126 // - 311/126
4*b+(5/6)*b+6/7-(311/126) = 0
4*b+(5/6)*b+6/7-311/126 = 0
29/6*b-29/18 = 0 // + 29/18
29/6*b = 29/18 // : 29/6
b = 29/18/29/6
b = 1/3
b = 1/3
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