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b in (-oo:+oo)
2.4 = (3/5)*(b-5) // - (3/5)*(b-5)
2.4-((3/5)*(b-5)) = 0
(-3/5)*(b-5)+2.4 = 0
2.4-3/5*(b-5) = 0
2.4-3/5*(b-5) = 0
5.4-3/5*b = 0
5.4-3/5*b = 0
5.4-3/5*b = 0 // - 5.4
-3/5*b = -5.4 // : -3/5
b = -5.4/(-3/5)
b = 9
b = 9
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