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b in (-oo:+oo)
(3/5)*b-(1/2) = 1.8 // - 1.8
(3/5)*b-(1/2)-1.8 = 0
(3/5)*b-1/2-1.8 = 0
3/5*b-2.3 = 0 // + 2.3
3/5*b = 2.3 // : 3/5
b = 2.3/3/5
b = 3.83333333
b = 3.83333333
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