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(Z-12)/4 = z/16 // - z/16
(Z-12)/4-(z/16) = 0
(Z-12)/4-z/16 = 0
(16*(Z-12))/(4*16)+(4*(-z))/(4*16) = 0
16*(Z-12)+4*(-z) = 0
16*Z-4*z-192 = 0
(16*Z-4*z-192)/(4*16) = 0
(16*Z-4*z-192)/(4*16) = 0 // * 4*16
16*Z-4*z-192 = 0
x belongs to the empty set
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