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