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b in (-oo:+oo)
(2/3)*b-((1/3)*b)+11 = 12 // - 12
(2/3)*b-((1/3)*b)-12+11 = 0
(2/3)*b+(-1/3)*b-12+11 = 0
1/3*b-1 = 0 // + 1
1/3*b = 1 // : 1/3
b = 1/1/3
b = 3
b = 3
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