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b in (-oo:+oo)
-89/54 = 2*b+(2/3)*b-(1/6) // - 2*b+(2/3)*b-(1/6)
1/6-(2*b)-((2/3)*b)-89/54 = 0
(-2/3)*b-2*b-89/54+1/6 = 0
-8/3*b-40/27 = 0 // + 40/27
-8/3*b = 40/27 // : -8/3
b = 40/27/(-8/3)
b = -5/9
b = -5/9
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