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b in (-oo:+oo)
(8*b-42)/6 = 42 // - 42
(8*b-42)/6-42 = 0
(8*b-42)/6+(-42*6)/6 = 0
8*b-42*6-42 = 0
8*b-294 = 0
(8*b-294)/6 = 0
(8*b-294)/6 = 0 // * 6
8*b-294 = 0
8*b-294 = 0 // + 294
8*b = 294 // : 8
b = 294/8
b = 147/4
b = 147/4
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