The number of tourists visiting a city doubles every month during the two-month period beginning in Jan, 1st and ending
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This is what I got I dont know if It should be an equation but that's all i can get to, gl
Sum means addition
negative 18 means -18
a number can be x
Sum of negative 18 and x should be 11
thus the equation is
negative 18 means -18
a number can be x
Sum of negative 18 and x should be 11
thus the equation is