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b in (-oo:+oo)
5/6 = (-2/5)*b+(1/3)*b // - (-2/5)*b+(1/3)*b
5/6-((-2/5)*b)-((1/3)*b) = 0
(2/5)*b+(-1/3)*b+5/6 = 0
1/15*b+5/6 = 0 // - 5/6
1/15*b = -5/6 // : 1/15
b = -5/6/1/15
b = -25/2
b = -25/2
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