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(3/5)*((2/3)*B+4)+b = 15 // - 15
(3/5)*((2/3)*B+4)+b-15 = 0
3/5*(2/3*B+4)+b-15 = 0
3/5*(2/3*B+4)+b-15 = 0
2/5*B+b-15+12/5 = 0
2/5*B+b-63/5 = 0
2/5*B+b-63/5 = 0
x belongs to the empty set
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