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b in (-oo:+oo)
(-2/3)*b+2/5 = (6/4)/5 // - (6/4)/5
(-2/3)*b+2/5-((6/4)/5) = 0
(-2/3)*b+2/5-3/10 = 0
1/10-2/3*b = 0 // - 1/10
-2/3*b = -1/10 // : -2/3
b = -1/10/(-2/3)
b = 3/20
b = 3/20
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