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b in (-oo:+oo)
1.6 = (4/5)*(b-4) // - (4/5)*(b-4)
1.6-((4/5)*(b-4)) = 0
(-4/5)*(b-4)+1.6 = 0
1.6-4/5*(b-4) = 0
1.6-4/5*(b-4) = 0
4.8-4/5*b = 0
4.8-4/5*b = 0
4.8-4/5*b = 0 // - 4.8
-4/5*b = -4.8 // : -4/5
b = -4.8/(-4/5)
b = 6
b = 6
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