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b in (-oo:+oo)
6*b+(5/6)*b+2 = 83/21 // - 83/21
6*b+(5/6)*b-(83/21)+2 = 0
6*b+(5/6)*b-83/21+2 = 0
41/6*b-41/21 = 0 // + 41/21
41/6*b = 41/21 // : 41/6
b = 41/21/41/6
b = 2/7
b = 2/7
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