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b in (-oo:+oo)
2.4 = (4/5)*(b-5) // - (4/5)*(b-5)
2.4-((4/5)*(b-5)) = 0
(-4/5)*(b-5)+2.4 = 0
2.4-4/5*(b-5) = 0
2.4-4/5*(b-5) = 0
6.4-4/5*b = 0
6.4-4/5*b = 0
6.4-4/5*b = 0 // - 6.4
-4/5*b = -6.4 // : -4/5
b = -6.4/(-4/5)
b = 8
b = 8
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