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(5*a+4)/60+15*d = 0
(5*a+4)/60+(15*60*d)/60 = 0
5*a+15*60*d+4 = 0
5*a+900*d+4 = 0
(5*a+900*d+4)/60 = 0
(5*a+900*d+4)/60 = 0 // * 60
5*a+900*d+4 = 0
x belongs to the empty set
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