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b in (-oo:+oo)
(2*b-3.4)/8 = 5 // - 5
(2*b-3.4)/8-5 = 0
(2*b-3.4)/8+(-5*8)/8 = 0
2*b-5*8-3.4 = 0
2*b-43.4 = 0
(2*b-43.4)/8 = 0
(2*b-43.4)/8 = 0 // * 8
2*b-43.4 = 0
2*b-43.4 = 0 // + 43.4
2*b = 43.4 // : 2
b = 43.4/2
b = 21.7
b = 21.7
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