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b in (-oo:+oo)
(2/5)*(1*b-4) = b/5 // - b/5
(2/5)*(1*b-4)-(b/5) = 0
(2/5)*(b-4)-(b/5) = 0
2/5*(b-4)-b/5 = 0
(2/5*5*(b-4))/5-b/5 = 0
2/5*5*(b-4)-b = 0
b-8 = 0
(b-8)/5 = 0
(b-8)/5 = 0 // * 5
b-8 = 0
b-8 = 0 // + 8
b = 8
b = 8
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