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b in (-oo:+oo)
(1/5)*b-((1/2)*b)+3/8 = 29/120 // - 29/120
(1/5)*b-((1/2)*b)+3/8-(29/120) = 0
(-1/2)*b+(1/5)*b+3/8-29/120 = 0
2/15-3/10*b = 0 // - 2/15
-3/10*b = -2/15 // : -3/10
b = -2/15/(-3/10)
b = 4/9
b = 4/9
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