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18*((2/9)*u+(1/3)*z) = 15 // - 15
18*((2/9)*u+(1/3)*z)-15 = 0
18*(2/9*u+1/3*z)-15 = 0
18*(2/9*u+1/3*z)-15 = 0
4*u+6*z-15 = 0
4*u+6*z-15 = 0
x belongs to the empty set
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