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b in (-oo:+oo)
(3/2)*b-((4/5)*b) = 28/5 // - 28/5
(3/2)*b-((4/5)*b)-(28/5) = 0
(3/2)*b+(-4/5)*b-28/5 = 0
7/10*b-28/5 = 0 // + 28/5
7/10*b = 28/5 // : 7/10
b = 28/5/7/10
b = 8
b = 8
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