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A movie theatre has a capacity of 41 seats. When there are d spectators in the theatre, there are d+13 empty seats. With t spectators, there are d+ 19 empty seats. What is the values of t?
41 seats, separated in two categories : empty and used. 1) d spectators 41=(d) + (d+13) d=14 2) t spectators 41=(t)+(d+19) t=8