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(2/5)*(d-10)+3*c+9 = 0
2/5*(d-10)+3*c+9 = 0
2/5*(d-10)+3*c+9 = 0
3*c+2/5*d-4+9 = 0
3*c+2/5*d+5 = 0
3*c+2/5*d+5 = 0
x belongs to the empty set
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