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(2/3)*(9*b-(2*f)) = 36 // - 36
(2/3)*(9*b-(2*f))-36 = 0
(2/3)*(9*b-2*f)-36 = 0
2/3*(9*b-2*f)-36 = 0
2/3*(9*b-2*f)-36 = 0
6*b-4/3*f-36 = 0
6*b-4/3*f-36 = 0
x belongs to the empty set
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