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b in (-oo:+oo)
1-3*b = (1/3)*b+133/33 // - (1/3)*b+133/33
1-3*b-((1/3)*b)-(133/33) = 0
(-1/3)*b-3*b-133/33+1 = 0
-10/3*b-100/33 = 0 // + 100/33
-10/3*b = 100/33 // : -10/3
b = 100/33/(-10/3)
b = -10/11
b = -10/11
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