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b in (-oo:+oo)
1.2 = (3/5)*(b-4) // - (3/5)*(b-4)
1.2-((3/5)*(b-4)) = 0
(-3/5)*(b-4)+1.2 = 0
1.2-3/5*(b-4) = 0
1.2-3/5*(b-4) = 0
3.6-3/5*b = 0
3.6-3/5*b = 0
3.6-3/5*b = 0 // - 3.6
-3/5*b = -3.6 // : -3/5
b = -3.6/(-3/5)
b = 6
b = 6
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