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b in (-oo:+oo)
(1/4)*b+(1/2)*b+2/5 = 23/20 // - 23/20
(1/4)*b+(1/2)*b+2/5-(23/20) = 0
(1/4)*b+(1/2)*b+2/5-23/20 = 0
3/4*b-3/4 = 0 // + 3/4
3/4*b = 3/4 // : 3/4
b = 3/4/3/4
b = 1
b = 1
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